CN114505160A - Coal-fired boiler synergistic solid waste recycling direct doping system and working method thereof - Google Patents
Coal-fired boiler synergistic solid waste recycling direct doping system and working method thereof Download PDFInfo
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- CN114505160A CN114505160A CN202210003981.XA CN202210003981A CN114505160A CN 114505160 A CN114505160 A CN 114505160A CN 202210003981 A CN202210003981 A CN 202210003981A CN 114505160 A CN114505160 A CN 114505160A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/02—Feeding devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G65/00—Loading or unloading
- B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
- B65G65/34—Emptying devices
- B65G65/40—Devices for emptying otherwise than from the top
- B65G65/46—Devices for emptying otherwise than from the top using screw conveyors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C2201/00—Codes relating to disintegrating devices adapted for specific materials
- B02C2201/06—Codes relating to disintegrating devices adapted for specific materials for garbage, waste or sewage
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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
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The direct doping system comprises a solid waste conveying system, and a coal mill feeding system and a coal conveying belt feeding system which are respectively communicated with the solid waste conveying system; the solid waste conveying system comprises an underground receiving hopper, an overground receiving hopper and a shaftless screw conveyor for conveying solid waste from the underground receiving hopper to the overground receiving hopper, wherein a high-level cache bin is arranged right above the overground receiving hopper, the bottom of the high-level cache bin is communicated with the overground receiving hopper through a vertical pipeline, and the top of the high-level cache bin is communicated with the bottom of the overground receiving hopper through a return pipeline II. This application sets up two feeding systems, and optional one or both of optional two kinds of modes are all selected, and feeding mode is nimble, and the practicality is strong, greatly reduces the underground receiving hopper size simultaneously, has reduced the consideration in aspects such as drainage and geological conditions, need not carry out special review flow, and reduction of erection time saves pit surface material, anticorrosive and water-fast material's use, has greatly reduced construction cost.
Description
Technical Field
The invention relates to the field of solid waste synergistic treatment, in particular to a coal-fired boiler synergistic solid waste recycling direct doping system and a working method thereof.
Background
Sewage treatment plants must produce a certain amount of semi-solid or solid matter, commonly referred to as "sludge," during the sewage treatment process. The sludge has small relative density, irregular shape, extremely high specific surface area and porosity, and is generally neutral or weakly acidic and weakly alkaline. High organic matter content, high heat value utilization value, high water content, poor dehydration property and odor. In addition, other substances are also present, such as: harmful microorganisms such as pathogenic bacteria and viruses, and difficultly degradable substances such as polychlorinated biphenyl and dioxin. The treatment and disposal of the sludge should follow the principles of reduction, stabilization, harmlessness and reclamation, and encourages the recovery and utilization of energy and resources in the sludge so as to achieve the purposes of energy conservation, emission reduction and cyclic economy development.
Under the background, the solid waste mixed combustion technology of the coal-fired power plant is accepted and paid attention by the power plant and local governments. Related national departments also set out a series of policies, and the requirements are to promote the coal-fired power plant to cooperatively treat solid wastes by resource and develop the construction of the coal-fired solid waste cooperative power generation demonstration project. The thermal power plant depends on the existing large-scale boiler and a perfect flue gas desulfurization and denitration treatment system, so that the solid waste can generate physical and chemical changes in the incineration process at the temperature of more than 1200 ℃, harmful substances in the solid waste can be treated in a harmless way, the solid waste amount is reduced, meanwhile, the heat contained in the solid waste can be provided for power generation of the power plant, and the principles of reduction, stabilization, harmlessness and recycling are met. Therefore, the solid waste mixed combustion mode is the optimal selection for solid waste treatment of the thermal power plant. The existing solid waste direct doping system needs to build a large-size pit, so that the cost and the maintenance cost are high, and meanwhile, the defects of poor flexibility and low safety of a direct doping system feeding point exist.
Disclosure of Invention
The invention aims to provide a direct doping system for utilizing solid waste resources in cooperation with a coal-fired boiler and a working method thereof, and aims to solve the technical problem of high cost and maintenance cost caused by the need of constructing a large-size pit; and solves the problems of poor flexibility and low safety of the adding point of the direct doping system in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
coal fired boiler is useless utilization of resources admittedly in coordination directly mixes system, its characterized in that: the system comprises a solid waste conveying system, and a coal mill feeding system and a coal conveying belt feeding system which are respectively communicated with the solid waste conveying system; the solid waste conveying system comprises an underground receiving hopper, an overground receiving hopper and a shaftless spiral conveyor for conveying solid waste from the underground receiving hopper to the overground receiving hopper, wherein the initial end of the shaftless spiral conveyor is positioned at the bottom of the underground receiving hopper and is obliquely and obliquely arranged from the underground receiving hopper to the overground receiving hopper, the upper part of the shaftless spiral conveyor extends inwards along the outer wall of the overground receiving hopper through a support, and the upper part of the shaftless spiral conveyor is driven by a motor and conveys the solid waste from the underground receiving hopper to the overground receiving hopper; and a high-level cache bin is arranged right above the overground receiving hopper, the bottom of the high-level cache bin is communicated with the overground receiving hopper through a vertical pipeline, and the top of the high-level cache bin is communicated with the bottom of the overground receiving hopper through a solid waste return pipeline II.
Further preferably, the coal conveying belt feeding system comprises a coal conveying belt feeding pipeline, and an electric switch valve I, a screw pump I, a switch valve II and a coal conveying belt are sequentially arranged on the coal conveying belt feeding pipeline from the solid waste flow direction.
Further, a first switch valve 17a and a third electric switch valve 17b are sequentially arranged on the vertical pipeline in the self-solid waste falling direction.
Furthermore, the coal mill feeding system comprises a coal mill feeding pipeline, and a switch valve IV, a screw pump II, a remote pressure gauge, a switch valve IV, a switch valve V and the coal mill are sequentially arranged on the coal mill feeding pipeline along the solid waste flow direction.
Furthermore, a first solid waste return pipeline is further arranged on the coal mill feeding pipeline, between the remote transmission pressure gauge and the fourth switch valve, a first solid waste outlet of the first solid waste return pipeline is communicated with an upper opening of an above-ground receiving hopper, and a sixth switch valve is arranged on the first solid waste return pipeline.
Furthermore, the solid waste return pipeline II is communicated with a coal conveying belt feeding pipeline between the screw pump I and the switch valve II, and an electric switch valve IV is arranged on the solid waste return pipeline II.
Furthermore, all be equipped with air compression system on coal pulverizer charging system and the defeated coal belt charging system, air compression system includes compressed air female pipe and the compressed air branch pipe with coal pulverizer charging system or defeated coal belt charging system intercommunication, be equipped with ooff valve seven on the compressed air branch pipe, the compressed air branch pipe communicates with the defeated coal belt charge pipeline between screw pump one and ooff valve two, perhaps, communicates with the coal pulverizer charge pipeline between ooff valve four and ooff valve five.
In addition, the top surface of the discharge opening of the underground collecting hopper is provided with a discharge grid, a discharge opening cover plate is arranged on the top surface of the discharge grid in a covering mode, one end of the discharge opening cover plate is hinged to the discharge opening, and an electro-hydraulic push rod used for pulling up or lowering down the discharge opening cover plate is arranged on the plate surface.
More preferably, shaftless screw conveyer multistage series connection installation realizes the transmission of overlength distance solid useless.
The working method of the coal-fired boiler synergistic solid waste recycling direct doping system is characterized by comprising the following steps of:
step one, temporarily storing solid wastes: solid waste is poured into an underground receiving hopper through a discharging grid by a box type solid waste vehicle, the underground receiving hopper is used as a solid waste transfer device, and the solid waste is improved to an inlet of an above-ground receiving hopper by a shaftless screw conveyor; the overground receiving hopper is a middle transportation and temporary storage bin for solid waste, and two outlets are arranged below the overground receiving hopper and are respectively communicated with a coal mill feeding system and a coal conveying belt feeding system through a single pipeline coal mill feeding pipeline and a coal conveying belt feeding pipeline;
step two, opening a high-order cache bin: the solid waste storage space in the underground receiving hopper and the ground receiving hopper cannot be loaded by the coal mill feeding system and the coal conveying belt feeding system, the electric switch valve IV is opened, solid waste in the ground receiving hopper enters the high-level cache bin from the ground receiving hopper, the coal conveying belt feeding pipeline and the solid waste return pipeline II, the high-level cache bin stores the daily material consumption of the coal mill feeding system and the coal conveying belt feeding system, the switch valve I17 a and the electric switch valve III 17b are opened when the solid waste is not supplied enough, and the solid waste falls into the ground receiving hopper 12;
step three, equipment maintenance: if the short-time shutdown is carried out within 24 hours, the shaftless screw conveyor, the screw pump I, the screw pump II, the electric switch valve I corresponding to the switch valve and the electric switch valve IV corresponding to the switch valve are closed, and the pipeline does not need to be flushed and drained; if the short-term shutdown is carried out within one week, except for shutdown equipment during the short-term shutdown, opening a system circulating valve, namely an electric switch valve and a switch valve; if the operation is stopped or maintained for a long time, the material quantity of the high-level cache bin is reduced as much as possible before the operation is stopped, if the screw pump is maintained, the switch valves of the inlet and the outlet of the corresponding pump are turned off, and the emptying pump and the front and rear pipelines are flushed to fix wastes; if the pipeline is overhauled, the fourth switch valve is turned off, the pump self-circulation switch valve, namely the electric switch valve IV and the switch valve VI is turned on, the solid waste in the pipeline automatically flows back into the high-level cache bin, and then the solid waste in the emptying pipeline is flushed;
step four, cleaning the pipeline: starting the device in the process of stopping operation or long-term maintenance, and opening the air compression system to introduce industrial water, thereby cleaning materials in the pipeline, preventing the inner wall from being corroded and the pipeline from being blocked and influencing the operation safety.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
firstly, the size of an underground receiving hopper is greatly reduced from the original 200m3Reduced to 25m3The original deep machine pit needs to be dug to be below 5m, the digging depth of the deep machine pit is improved to be above 5m by the conventional method, the consideration on the aspects of drainage, geological conditions and the like is reduced, a special evaluation flow is not needed, the construction period is shortened, meanwhile, the use of surface materials, anticorrosion materials and waterproof materials of the pit is saved, and the construction cost is greatly reduced;
in addition, the self-circulation system of the high-level buffer bin and the ground receiving hopper is added, and the volumes of the self-circulation system and the ground receiving hopper are 160m respectively3And 30m3The engineering investment and maintenance cost are greatly reduced, the operation of the excavator is reduced, the construction period time is shortened, the relationship between system maintenance and solid waste storage and supply is ensured, meanwhile, the remote transmission pressure gauge is convenient to monitor the safety performance and the stability performance of the system, the solid waste feeding point can be switched according to the actual condition, the feeding points are respectively a coal conveying belt and a coal mill, and the flexibility of the system and the solid waste are ensuredAnd (4) stable direct doping.
Drawings
FIG. 1 is a schematic structural view of a direct doping system for synergistic solid waste resource utilization of a coal-fired boiler according to the present application;
figure 2 is a schematic representation of the process flow of the present application.
Reference numerals: 1-a solid waste conveying system; 11-an underground receiving hopper; 12-an above ground receiving hopper; 13-shaftless screw conveyor; 14-a scaffold; 15-a motor; 16-high cache; 17-a vertical pipe; 18-solid waste return pipeline II; 19-electric switch valve four; 2-a coal mill feeding system; 21-a coal mill feeding pipeline; 22-switch valve four; 23-screw pump II; 24-remote transmission pressure gauge; 25-switch valve four; 26-switching valve five; 27-a coal mill; 3-a coal conveying belt charging system; 31-coal conveying belt feeding pipeline; 32-screw pump I; 33-a second switch valve; 34-a coal conveying belt; 37-an electric switch valve I; 4-an air compression system; 41-compressed air main pipe; 43-compressed air manifold; 43-switch valve seven; 5-discharging grids; 6-discharge port cover plate; 7-electro-hydraulic push rod.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
The direct doping system for the synergistic utilization of solid waste resources of the coal-fired boiler comprises a solid waste conveying system 1, and a coal mill feeding system 2 and a coal conveying belt feeding system 3 which are respectively communicated with the solid waste conveying system 1, as shown in fig. 1 and 2; the solid waste conveying system 1 comprises an underground receiving hopper 11, an overground receiving hopper 12 and a shaftless screw conveyor 13 for conveying solid waste from the underground receiving hopper 11 to the overground receiving hopper 12, wherein the initial end of the shaftless screw conveyor 13 is positioned at the bottom of the underground receiving hopper 11 and is obliquely and obliquely arranged from the underground receiving hopper 11 to the overground receiving hopper 12, the upper part of the shaftless screw conveyor 13 extends inwards along the outer wall of the overground receiving hopper 12 through a support 14, and the upper part of the shaftless screw conveyor 13 is driven by a motor 15 and conveys solid waste from the underground receiving hopper 11 to the overground receiving hopper 12; a high-level buffer bin 16 is arranged right above the ground receiving hopper 12, the bottom of the high-level buffer bin 16 is communicated with the ground receiving hopper 12 through a vertical pipeline 17, the top of the high-level buffer bin is communicated with the bottom of the ground receiving hopper 12 through a solid waste backflow pipeline II 18, and the shaftless spiral conveyor 13 is installed in a multistage series mode to achieve ultra-long distance solid waste transmission. .
The high-level cache bin 16 enables the underground receiving hopper to originally be 200m3Reduced to 25m3The ground material receiving hopper and the high-level cache bin are correspondingly added, and the volumes of the above-ground material receiving hopper and the high-level cache bin are respectively 160m3And 30m3The high-level cache bin 16 can store the daily material consumption of the coal mill feeding system 2 and the coal conveying belt feeding system 3.
The coal conveying belt feeding system 3 comprises a coal conveying belt feeding pipeline 31, an electric switch valve I37, a screw pump I32, a switch valve II 33 and a coal conveying belt 34 are sequentially arranged on the coal conveying belt feeding pipeline 31 from the solid waste flow direction, a solid waste return pipeline II 18 is communicated with the coal conveying belt feeding pipeline 31 between the screw pump I32 and the switch valve II 33, and an electric switch valve IV 19 is arranged on the solid waste return pipeline II 18.
The coal mill feeding system 2 comprises a coal mill feeding pipeline 21, wherein a switch valve four 22, a screw pump two 23, a remote transmission pressure gauge 24, a switch valve four 25, a switch valve five 26 and a coal mill 27 are sequentially arranged on the coal mill feeding pipeline 21 along the solid waste flow direction, a solid waste return pipeline one 28 is further arranged on the coal mill feeding pipeline 21 and between the remote transmission pressure gauge 24 and the switch valve four 25, a solid waste outlet of the solid waste return pipeline one 28 is communicated with the upper opening of the ground receiving hopper 12, and a switch valve six 29 is arranged on the solid waste return pipeline one 28.
In addition, in order to prevent equipment and pipeline accidents, in the actual solid waste blending combustion process, standby channels are arranged on a coal mill feeding system 2 and a coal conveying belt feeding system 3, namely, two pipeline interfaces are additionally arranged at the lower end of an overground receiving hopper and are respectively connected with a solid waste screw pump. The solid waste conveying pipeline adopts a seamless steel pipe design, so that solid waste is prevented from leaking, the solid waste conveying pipeline is periodically flushed by power plant process water, and waste water is discharged to a power plant waste water pool.
The coal mill feeding system 2 and the coal conveying belt feeding system 3 are both provided with an air compression system 4, the air compression system 4 comprises a compressed air main pipe 41 and a compressed air branch pipe 42 communicated with the coal mill feeding system 2 or the coal conveying belt feeding system 3, the compressed air branch pipe 42 is provided with a switch valve seven 43, and the compressed air branch pipe 42 is communicated with the coal conveying belt feeding pipeline 31 between the screw pump one 32 and the switch valve two 33 or communicated with the coal mill feeding pipeline 21 between the switch valve four 25 and the switch valve five 26.
11 discharge opening top surfaces of underground collecting hopper are equipped with discharge grid 5, and 5 top surfaces of discharge grid are covered and are equipped with discharge opening apron 6, and 6 one end of discharge opening apron is articulated with the discharge opening, and the face is equipped with and is used for pulling up or transfers the electric liquid push rod 7 of discharge opening apron 6.
The working method of the coal-fired boiler synergistic solid waste resource utilization direct-doping system is characterized by comprising the following steps of:
step one, temporarily storing solid wastes: the coal mill feeding system and the coal conveying belt feeding system 3 are simultaneously or independently started, the coal conveying belt feeding system 3 is started, and the coal powder on the coal conveying belt at the direct-doping addition point is started to start the solid waste conveying system 1, so that the coal powder and the solid waste are mixed and fed into the furnace, and the influence on combustion in the furnace is reduced; solid waste is poured into an underground receiving hopper 11 through a box type solid waste vehicle and a discharging grid 5, the underground receiving hopper 11 is used as a solid waste transfer device, and the solid waste is improved to an inlet of an above-ground receiving hopper 12 through a shaftless screw conveyor 13; the overground receiving hopper 12 is a middle transportation and temporary storage bin for solid wastes, and two outlets are arranged below and are respectively communicated with the coal mill feeding system 2 and the coal conveying belt feeding system 3 through a single pipeline coal mill feeding pipeline 21 and a coal conveying belt feeding pipeline 31;
step two, opening the high-order cache bin 16: the solid waste storage capacity in the underground receiving hopper 11 and the ground receiving hopper 12 cannot be loaded by the coal mill feeding system 2 and the coal conveying belt feeding system 3, the electric switch valve IV 19 is opened, the solid waste in the ground receiving hopper 12 enters the high-level cache bin 16 from the ground receiving hopper 12, the coal conveying belt feeding pipeline 31 and the solid waste return pipeline II 18, the high-level cache bin 16 stores the daily material consumption of the coal mill feeding system 2 and the coal conveying belt feeding system 3, the switch valve I17 a and the electric switch valve III 17b are opened when the solid waste is not supplied enough, the solid waste falls into the ground receiving hopper 12 by self weight, and the continuous supply of the solid waste is ensured;
step three, equipment maintenance: if the operation is stopped for a short time, the shaftless screw conveyor 13, the first screw pump 32, the second screw pump 23, the electric switch valve 37 corresponding to the switch valve and the fourth switch valve 22 are closed within the operation stop time of 24h, and the pipelines do not need to be washed and drained; if the short-term shutdown is carried out, the system circulating valves, namely the electric switch valve 19 and the switch valve 26 are opened in one week of the shutdown time except for the shutdown equipment during the short-term shutdown; if the operation is stopped or maintained for a long time, the material quantity of the high-level cache bin 16 is reduced as much as possible before the operation is stopped, if the screw pump is maintained, the switch valves of the inlet and the outlet of the corresponding pump are turned off, and the emptying pump and the front and rear pipelines are flushed to fix wastes; if the pipeline is overhauled, the fourth switch valve 25 is turned off, the pump self-circulation switch valves, namely the fourth electric switch valve 19 and the sixth switch valve 29, are opened, the solid wastes in the pipeline automatically flow back into the high-level cache bin 16, and then the solid wastes in the pipeline are flushed and discharged;
step four, cleaning the pipeline: starting in the process of equipment outage or long-term maintenance, introducing industrial water to open the air compression system (4), thereby clearing solid waste in the pipeline, and the solid waste flows back into the high-order cache bin when a long-term project is shut down, so that the inner wall corrosion and pipeline blockage are prevented, and the operation safety is prevented from being influenced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. Coal fired boiler is useless utilization of solid resource directly mixes system in coordination, its characterized in that: comprises a solid waste conveying system (1), and a coal mill feeding system (2) and a coal conveying belt feeding system (3) which are respectively communicated with the solid waste conveying system (1); the solid waste conveying system (1) comprises an underground receiving hopper (11), an overground receiving hopper (12) and a shaftless spiral conveyor (13) for conveying solid waste from the underground receiving hopper (11) to the overground receiving hopper (12), wherein the initial end of the shaftless spiral conveyor (13) is positioned at the bottom of the underground receiving hopper (11) and is obliquely and obliquely arranged from the underground receiving hopper (11) to the overground receiving hopper (12), the upper part of the shaftless spiral conveyor (13) extends inwards along the outer wall of the overground receiving hopper (12) through a support (14), the upper part of the shaftless spiral conveyor (13) is driven by a motor (15), and the solid waste is conveyed from the underground receiving hopper (11) to the overground receiving hopper (12); a high-level buffer bin (16) is arranged right above the ground receiving hopper (12), the bottom of the high-level buffer bin (16) is communicated with the ground receiving hopper (12) through a vertical pipeline (17), and the top of the high-level buffer bin is communicated with the bottom of the ground receiving hopper (12) through a solid waste backflow pipeline II (18).
2. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 1, characterized in that: the coal conveying belt feeding system (3) comprises a coal conveying belt feeding pipeline (31), wherein an electric switch valve I (37), a screw pump I (32), a switch valve II (33) and a coal conveying belt (34) are sequentially arranged on the coal conveying belt feeding pipeline (31) from the solid waste flow direction.
3. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 1, characterized in that: and a first switch valve (17 a) and a third electric switch valve (17 b) are sequentially arranged on the vertical pipeline (17) in the self-solid waste falling direction.
4. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 1, characterized in that: the coal mill feeding system (2) comprises a coal mill feeding pipeline (21), and a switch valve four (22), a screw pump two (23), a remote pressure gauge (24), a switch valve four (25), a switch valve five (26) and a coal mill (27) are sequentially arranged on the coal mill feeding pipeline (21) along the solid waste flow direction.
5. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 4, characterized in that: and a first solid waste return pipeline (28) is further arranged on the coal mill feeding pipeline (21) and between the remote pressure gauge (24) and the fourth switch valve (25), an outlet of the first solid waste return pipeline (28) is communicated with an upper opening of the ground receiving hopper (12), and a sixth switch valve (29) is arranged on the first solid waste return pipeline (28).
6. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 4, characterized in that: and the solid waste return pipeline II (18) is communicated with a coal conveying belt feeding pipeline (31) between the screw pump I (32) and the switch valve II (33), and an electric switch valve IV (19) is arranged on the solid waste return pipeline II (18).
7. The coal-fired boiler coupled sludge resource utilization direct doping system of claim 4, characterized in that: the coal mill feeding system (2) and the coal conveying belt feeding system (3) are provided with air compression systems (4), each air compression system (4) comprises a compressed air main pipe (41) and a compressed air branch pipe (42) communicated with the coal mill feeding system (2) or the coal conveying belt feeding system (3), the compressed air branch pipe (42) is provided with a switch valve seven (43), the compressed air branch pipe (42) is communicated with a coal conveying belt feeding pipeline (31) between a screw pump I (32) and a switch valve II (33), or communicated with a coal mill feeding pipeline (21) between a switch valve four (25) and a switch valve five (26).
8. The coal fired boiler synergy solid waste resource utilization direct doping system of claim 4, characterized in that: underground receiving hopper (11) discharge opening top surface is equipped with discharge grid (5), discharge grid (5) top surface lid is equipped with discharge opening apron (6), discharge opening apron (6) one end is articulated with the discharge opening, and the face is equipped with and is used for pulling up or transfers electric liquid push rod (7) of discharge opening apron (6).
9. The coal fired boiler synergistic solid waste resource utilization direct doping system of claim 4, characterized in that: the shaftless screw conveyor (13) is installed in a multi-stage series mode, and ultra-long-distance solid waste transmission is achieved.
10. The working method of the coal-fired boiler synergistic solid waste resource utilization direct doping system as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
step one, temporarily storing solid wastes: the coal mill feeding system (2) and the coal conveying belt feeding system (3) are started simultaneously or independently, the coal conveying belt feeding system (3) is started, and the solid waste conveying system (1) is started after coal powder on a coal conveying belt at a direct-doping feeding point is started; solid waste vehicles are poured into an underground receiving hopper (11) through a discharging grid (5), the underground receiving hopper (11) is used as a solid waste transfer device, and solid waste is lifted to an inlet of an overground receiving hopper (12) through a shaftless screw conveyor (13); the overground receiving hopper (12) is a middle transportation and temporary storage bin for solid wastes, and two outlets are arranged below and are respectively communicated with the coal mill feeding system (2) and the coal conveying belt feeding system (3) through a single pipeline coal mill feeding pipeline (21) and a coal conveying belt feeding pipeline (31);
step two, opening a high-order cache bin (16): the solid waste storage capacity in an underground receiving hopper (11) and an above-ground receiving hopper (12) can not be loaded by a coal mill feeding system (2) and a coal conveying belt feeding system (3), an electric switch valve IV (19) is opened, solid waste in the above-ground receiving hopper (12), a coal conveying belt feeding pipeline (31) and a solid waste return pipeline II (18) enters a high-level cache bin (16), the high-level cache bin (16) stores the daily consumption of the coal mill feeding system (2) and the coal conveying belt feeding system (3), a switch valve I (17 a) and an electric switch valve III (17 b) are opened when the supply of the solid waste is insufficient, and the solid waste falls into the above-ground receiving hopper (12);
step three, equipment maintenance: if the short-time shutdown is carried out within 24h, the shaftless screw conveyor (13), the screw pump I (32), the screw pump II (23), the electric switch valve I (37) of the corresponding switch valve and the switch valve IV (22) are closed, and the pipeline does not need to be washed and drained; if the short-term shutdown is carried out, in one week of the shutdown time, except for shutdown equipment in the short-term shutdown, opening system circulating valves, namely an electric switch valve (19) and a switch valve (26); if the operation is stopped or maintained for a long time, the material quantity of the high-level cache bin (16) is reduced as much as possible before the operation is stopped, if the screw pump is maintained, the switch valves of the inlet and the outlet of the corresponding pump are turned off, and the emptying pump and the front and rear pipelines are flushed to fix wastes; if the pipeline is overhauled, the fourth switch valve (25) is turned off, the pump self-circulation switch valves, namely the electric switch valve (19) and the switch valve (29), are opened, the solid waste in the pipeline automatically flows back into the high-level cache bin (16), and then the solid waste in the emptied pipeline is flushed;
step four, cleaning the pipeline: the device is started in the process of equipment outage or long-term maintenance, and the air compression system (4) is opened to introduce industrial water into the pipeline, so that solid waste in the pipeline is cleaned, and the solid waste flows back into the high-level cache bin when a long-term project is shut down, thereby preventing the corrosion of the inner wall and the blockage of the pipeline and influencing the operation safety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210003981.XA CN114505160B (en) | 2022-01-05 | 2022-01-05 | Coal-fired boiler synergistic solid waste recycling direct doping system and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210003981.XA CN114505160B (en) | 2022-01-05 | 2022-01-05 | Coal-fired boiler synergistic solid waste recycling direct doping system and working method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114505160A true CN114505160A (en) | 2022-05-17 |
| CN114505160B CN114505160B (en) | 2023-03-31 |
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| CN115539979A (en) * | 2022-09-22 | 2022-12-30 | 国能龙源环保有限公司 | Coal-fired boiler synergistic solid waste resource utilization uniform mixing coupling co-combustion system and method |
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