CN113858441A - Preparation system and process of fly ash mixed slurry for pipeline transportation - Google Patents
Preparation system and process of fly ash mixed slurry for pipeline transportation Download PDFInfo
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- CN113858441A CN113858441A CN202111019968.5A CN202111019968A CN113858441A CN 113858441 A CN113858441 A CN 113858441A CN 202111019968 A CN202111019968 A CN 202111019968A CN 113858441 A CN113858441 A CN 113858441A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/0481—Plant for proportioning, supplying or batching
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
- B28C7/04—Supplying or proportioning the ingredients
- B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
- B28C7/10—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of rotary members, e.g. inclinable screws
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/10—Lime cements or magnesium oxide cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/30—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing magnesium cements or similar cements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a system and a process for preparing fly ash mixed slurry for pipeline transportation. The mixed material slurry preparation system comprises a gelatinizing agent constant feeder, a coal ash constant feeder, a dry mixed material screw conveyor, a double-shaft stirrer, a slurry storage tank and a constant water adding system, wherein the constant water adding system comprises a process water tank, a first water adding metering pump and a second water adding metering pump, the process water tank leads to a water adding port of the double-shaft stirrer through the first water adding metering pump, and the process water tank is communicated with a slurry outlet pipe of the double-shaft stirrer through the second water adding metering pump. The fly ash mixed slurry is formed by sequentially mixing fly ash with the particle size of not more than 1.2mm and a gelatinizing agent through dry materials, quantitatively adding water, mixing and stirring, wherein the weight concentration of the dry powder is 45-60%. The invention not only solves the problem of environmental pollution in the transportation process of the fly ash, but also realizes the waste utilization of the fly ash, does not cause secondary pollution and improves the environmental protection performance.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to a method for treating fly ash and recycling the treated fly ash through pipeline transportation, in particular to a system and a process for preparing fly ash mixed slurry for pipeline transportation.
Background
The coal ash can be well recycled as a building material and a road and bridge material, and through years of development, two traditional utilization modes are provided, wherein the first mode is to build a large-area permanent ash yard for permanent stacking, the treatment mode needs to occupy a large amount of land and carry out anti-seepage treatment on the ground, even if the coal ash can pollute underground water under the action of rainwater, raise dust can pollute the surrounding environment, and secondary pollution can be caused to the environment around a highway in the transferring process; the second method is to transport to a road and bridge construction site for paving as a roadbed material or to fill underground, or to a brick factory for making machine-made bricks. In the existing method for recycling the fly ash, the fly ash is used as a roadbed material or underground filling, but the transportation of the fly ash is a difficult problem, and because the fly ash is generally dry powder, the fly ash can cause dust pollution to the surrounding environment in the transportation process.
The pipeline slurry transportation is a process of taking water as a carrier, crushing and grinding minerals to prepare qualified slurry with certain grain size distribution and concentration, and transporting the slurry through a pipeline. The pipeline conveying technology of the slurry is an energy-saving and environment-friendly technology, and has the advantages of small occupied area, strong adaptability, no pollution and the like compared with the traditional material conveying mode. In order to ensure the safe and economic operation of the slurry pipeline, on one hand, the conveyed slurry is required to have good stability so as to prevent the pipeline from being blocked due to the sedimentation of particles, thereby increasing the conveying pressure, influencing the safe operation of the system, causing the consequences of maintenance and economic loss and the like; meanwhile, the viscosity coefficient of the conveyed slurry is required to be small so as to reduce energy loss caused by frictional resistance, thereby reducing the pressure grade of equipment and pipelines and reducing the manufacturing cost of a system. Therefore, the requirements on the concentration of the slurry and the particle size of the slurry in the process of pipeline slurry transportation are high, if the particle size of coarse particles in the slurry is too large, the pipeline is blocked due to sedimentation, and the concentration change is large in the process of transportation, so that the continuity and stability of transportation are difficult to ensure. The traditional pipeline conveying experience cannot meet the requirement of the fly ash pipeline conveying, and in addition, the fly ash needs to be modified by some additives in the filling process, otherwise, the requirement of underground filling cannot be met.
Disclosure of Invention
The invention aims to provide a system and a process for preparing fly ash mixed slurry for pipeline transportation aiming at the transportation problem of the fly ash during recycling, the mixed slurry is mixed by a special device and process, the mixed slurry can meet the requirements of pipeline transportation and underground filling, the environmental pollution problem existing in the transportation of the fly ash can be solved, and the recycling problem of waste fly ash can be solved.
In order to solve the technical problems, the invention provides a fly ash mixed slurry preparation system for pipeline transportation, which comprises a gelatinizing agent constant feeder, a fly ash constant feeder, a dry mixture screw conveyor, a double-shaft mixer, a slurry storage tank and a constant water adding system, wherein discharge ports of the gelatinizing agent constant feeder and the fly ash constant feeder are respectively communicated with a feed port of the dry mixture screw conveyor, an outlet of the dry mixture screw conveyor is communicated with the double-shaft mixer, a discharge port of the double-shaft mixer is communicated with a feed port of the slurry storage tank through a slurry outlet pipe, a discharge metering pump is arranged on the slurry outlet pipe, and a stirring mechanism is arranged in the slurry storage tank; the quantitative water adding system comprises a process water tank, a first water adding metering pump and a second water adding metering pump, the process water tank leads to a water adding port of the double-shaft stirrer through the first water adding metering pump, the process water tank is communicated with a slurry outlet pipe of the double-shaft stirrer through the second water adding metering pump, and a connecting point of the second water adding metering pump and the slurry outlet pipe is arranged between the double-shaft stirrer and the discharging metering pump.
The further technical scheme of the invention is as follows: the mixed slurry preparation system also comprises a control device, wherein the control device comprises a control box with a control panel, a first concentration meter arranged on the slurry outlet pipe, a second concentration meter arranged at the discharge port of the slurry storage tank, a first liquid level meter arranged at the top of the inner cavity of the double-shaft stirrer and a second liquid level meter arranged at the top in the slurry storage tank; the signal output ends of the first concentration meter, the second concentration meter, the first liquid level meter and the second liquid level meter are connected with the signal input end of the control box, and the signal output end of the control box is connected with the signal input ends of the first water adding metering pump, the second water adding metering pump, the stirring shaft control system of the double-shaft stirring machine and the control system of the stirring mechanism in the slurry storage tank.
The further technical scheme of the invention is as follows: the slurry preparation system also comprises a terminal fly ash mixed slurry dehydration device and a terminal filtrate circulating device, wherein the terminal filtrate circulating device comprises a terminal filtrate collecting tank and a filtrate tank water supplementing metering pump, and a third liquid level meter is arranged in the terminal filtrate collecting tank; conveying the fly ash mixed slurry discharged from the slurry storage tank to a terminal fly ash mixed slurry dehydrating device through a conveying pipeline for dehydration treatment, communicating a filtrate discharge port of the fly ash mixed slurry dehydrating device with a terminal filtrate collection tank through a drain pipe, and arranging a drain pump on the drain pipe; the water outlet of the terminal filtrate collecting tank is communicated with the water inlet of the double-shaft stirrer through a filtrate metering pump, and the process water tank is communicated with the water inlet of the terminal filtrate collecting tank through a water replenishing metering pump of the filter liquid tank; and the signal output end of the third liquid level meter is connected with the signal input end of the control box, and the signal output end of the control box is connected with the control end of the filtrate tank water replenishing metering pump.
The invention has the following excellent technical scheme: the ground paste preparation system still includes fly ash pretreatment systems, fly ash pretreatment systems includes the former feed bin of fly ash, the breaker, the milling machine, scraper conveyor and fly ash surge bin, the feed inlet in the former feed bin of fly ash is equipped with belt conveyor, the discharge gate below is equipped with the feed belt, the feed belt discharge end passes through the feed inlet intercommunication of chute and breaker, the below of breaker is arranged in to the milling machine, its feed inlet docks with the discharge gate of breaker, the milling machine discharge gate below is arranged in to scraper conveyor's feed inlet to carry the fly ash after handling the milling machine to the fly ash surge bin in through scraper conveyor, fly ash surge bin's discharge gate below is arranged in to fly ash batcher's feed inlet.
The invention has the following excellent technical scheme: the stirring mechanism in the slurry storage tank adopts double-shaft stirring; an automatic sampling device is arranged on the double-shaft stirrer and is in signal connection with the control box.
In order to solve the technical problems, the invention also provides a preparation process of the fly ash mixed slurry for pipeline transportation, which is characterized by comprising the following steps of:
(1) adding 75-90% of fly ash and 10-25% of gelling agent into a dry-mixed material screw conveyor according to the mass percentage, sequentially mixing materials, quantitatively adding water, mixing and stirring to form mixed slurry with the dry powder weight concentration of 45-60%; the grain size of the fly ash and the gelling agent is not more than 1.2mm, and the gelling agent is any one or a mixture of more of quicklime, water glass, magnesium materials, cement and resin;
(2) conveying the fly ash dry powder mixture uniformly mixed by the dry mixing screw conveyor in the step (1) to a double-shaft stirrer, adding water, uniformly mixing and stirring, preparing fly ash mixed slurry with the weight concentration of 45-60%, and conveying the fly ash mixed slurry to a slurry storage tank; the mixing water is added and is equipped with two water points, and first water point setting is at the water inlet of double-shaft mixer, and the second water point setting is between double-shaft mixer and storage thick liquid jar to through two water points control storage thick liquid jar discharged fly ash mix the weight concentration of ground paste 45% -60%, mix in the ground paste granule particle size and be not more than 1.2 mm.
The further technical scheme of the invention is as follows: the preparation process also comprises the recycling of the terminal filtrate, and the specific process is as follows:
conveying the fly ash mixed slurry with the weight concentration of 45-60% discharged from the slurry storage tank to a terminal through a pipeline, forming fly ash mixed slurry with the weight concentration of more than 70% through dehydration treatment, wherein the fly ash mixed slurry can be directly used for underground filling, and filtrate after the dehydration treatment is collected into a terminal filtrate collection tank and returns to a double-shaft stirrer through a filtrate metering pump to be repeatedly used for preparing the fly ash mixed slurry.
The invention has the following excellent technical scheme: the preparation process also comprises an automatic water adding control process, wherein online concentration meters are arranged on a connecting pipeline between the double-shaft stirrer and the slurry storage tank and a slurry outlet of the slurry storage tank, liquid level meters are arranged at the tops of the double-shaft stirrer, the slurry storage tank and the terminal filtrate collecting tank, and process water is provided for the whole system through a process water tank; a first water adding metering pump is arranged between the process water tank and the double-shaft stirrer and serves as a first water adding point, a second water adding metering pump is arranged on a connecting pipe between the double-shaft stirrer and the slurry storage tank and serves as a second water adding point, the second water adding point is arranged between the double-shaft stirrer and the discharge metering pump, and a filtrate tank water supplementing metering pump is arranged between the process water tank and the terminal filtrate collection tank and serves as a water supplementing point; the concentration of the mixed slurry of the fly ash discharged by the double-shaft stirrer and the slurry storage tank is respectively monitored by the online concentration meters of the connecting pipeline between the double-shaft stirrer and the slurry storage tank and the slurry outlet of the slurry storage tank, the liquid level meters of the double-shaft stirrer, the slurry storage tank and the terminal filtrate collection tank respectively monitor the liquid level in the corresponding cavity, and according to the concentration monitored online and the liquid level conditions in different cavities, the first water adding metering pump, the second water adding metering pump and the filtrate tank water supplementing metering pump are controlled to add water, so that the final concentration of the mixed slurry of the fly ash is controlled to be 45% -60%.
The invention is provided with two water adding points and one water supplementing point for water supplementing adjustment and water quantity control, wherein the water adding points are provided with metering devices for strictly controlling the water adding quantity of each water adding point. So as to accurately control the concentration of the mixed slurry conveyed by the fly ash pipeline. A double-shaft stirring device is arranged on a pipeline between the double-shaft stirrers of the process water tank to supplement process water for metering and provide process water for the double-shaft stirrers; a metering pump for replenishing process water to the terminal filtrate return tank is arranged on a pipeline between the process water tank and the terminal filtrate collection tank, and the metering pump can replenish process water to the terminal filtrate collection tank for adjusting the concentration of filtrate in the terminal filtrate collection tank or for replenishing when the filtrate amount in the terminal filtrate collection tank is insufficient; the rear part of the process water tank is connected with the outlet of the double-shaft stirrer and is provided with a process water replenishing metering pump, and a water adding point is arranged on a pipeline between the double-shaft stirrer and the discharge metering pump of the double-shaft stirrer so as to replenish process water for adjusting the concentration of the fly ash mixed slurry conveyed to the double-shaft stirring slurry storage tank 20 and waiting for pipeline conveying. Thereby accurately controlling the concentration of the mixed slurry in the fly ash pipeline transportation so as to meet the pipeline transportation requirement. Thereby realizing multi-point and multi-stage regulation and controlling the concentration of the mixed slurry conveyed by the fly ash pipeline.
The invention has the beneficial effects that:
(1) according to the invention, the fly ash and the gelatinizer are mixed according to a special proportion, and the concentration and the granularity range of the mixed slurry are controlled by the pulping system and the control system to prepare the fly ash mixed slurry capable of meeting pipeline transportation, so that the transportation problem of the fly ash is solved, and the environment-friendly transportation of the fly ash can be realized;
(2) before the dry-mixed material double-shaft stirring device for feeding the fly ash and the gelling agent, the dry-mixed material is firstly mixed by the dry-mixed material screw conveyer, so that the uniformity of the dry-mixed material is improved; and the fly ash is subjected to a series of mat treatment before being mixed, so that the particle size of the fly ash is not more than 1.2mm, and the influence on pipeline transportation due to large particle size is avoided.
(3) The mixing system is provided with 3 water adding points, a constant feeder and a control system for accurate feedback adjustment and concentration control, the crusher is arranged for controlling the granularity of the gelatinizing agent, and the control system and the reasonable feedback control adjustment method are provided for preparing the fly ash pipeline conveying mixed slurry with good characteristics.
The system and the process in the invention are safe and stable in operation, and the device is economical, clean, environment-friendly and energy-saving, and is convenient to install, use and maintain. The fly ash slurry obtained by mixing the fly ash and the gel according to the specific proportion and the special mixing process meets the requirements of pipeline transportation and underground filling, not only solves the problem of environmental pollution in the transportation process of the fly ash, but also realizes the waste utilization of the fly ash, does not cause secondary pollution, and improves the environmental protection performance.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention;
FIG. 2 is a control schematic of the present invention
In the figure: 1-gelatinizing agent quantitative feeder, 2-fly ash quantitative feeder, 3-dry mixture screw conveyor, 4-double shaft mixer, 400-first level meter, 401-slurry outlet pipe, 5-slurry storage tank, 500-second level meter, 501-stirring mechanism, 6-process water tank, 7-first water adding metering pump, 8-second water adding metering pump, 9-discharge metering pump, 10-first concentration meter, 11-terminal filtrate collection tank, 1100-third level meter, 12-filtrate tank water adding metering pump, 13-filtrate metering pump, 14-second concentration meter, 15-crusher, 16-pulverizer, 17-scraper conveyor, 18-fly ash buffer bin, 19-terminal mixed slurry dewatering device, 1900-fly ash discharge pipe, 20-feeding belt, 21-control box, 22-conveyor, 23-conveying pipeline, 24-discharge pump, 25-automatic sampling device, 26-fly ash raw material bin and 27-gelatinizing agent bin.
Detailed Description
The invention is further illustrated by the following figures and examples. Fig. 1 to 2 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inside", "outside", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the products of the present invention are conventionally placed in use, or the orientations or positional relationships that are conventionally understood by those skilled in the art, and are used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected to each other, indirectly connected to each other through an intermediate member, or connected to each other through the inside of two members. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The fly ash mixed slurry preparation system used in the invention comprises a fly ash pretreatment system, a gelatinizing agent bin 27, a gelatinizing agent constant feeder 1, a fly ash constant feeder 2, a dry blend screw conveyor 3, a double-shaft stirrer 4, a slurry storage tank 5 and a quantitative water adding system as shown in figure 1, wherein the fly ash pretreatment system comprises a fly ash raw material bin 26, a crusher 15, a pulverizer 16, a scraper conveyor 17 and a fly ash buffer bin 18, and the quantitative water adding system comprises a process water tank 6, a first water adding metering pump 7 and a second water adding metering pump 8. Set up former feed bin 26 of fly ash under the belt conveyor 22, set up feed belt 20 under the former feed bin 26 of fly ash, feed belt 20 is connected with breaker 15 through the chute down, 15 down materials entering milling machine 16 of breaker, set up scraper conveyor 17 under the milling machine 16, set up fly ash surge bin 18 under scraper conveyor 17, fly ash surge bin 18 is connected fly ash constant feeder 2 down, dry blend screw conveyer 3 is arrived in the feed, gelatinizing 1 is passed through to gelatinizing agent that the particle diameter is not more than 1.2mm after grinding in gelatinizing agent storehouse 27, dry blend screw conveyer 3 is arrived in the feed, dry blend screw conveyer 3 is down set up double- shaft mixer 4, 4 inner chamber tops of double-shaft mixer set up first level gauge 400. A first water adding metering pump 7 used for supplementing process water into the double-shaft stirrer 4 is arranged on a pipeline between the process water tank 6 and the double-shaft stirrer 4, a second water adding metering pump 8 leading to a slurry outlet pipe 401 of the double-shaft stirrer 4 is arranged on a pipeline behind the process water tank 6, and a water adding point of the second water adding metering pump 8 is arranged on a pipeline between the double-shaft stirrer 4 and the discharge metering pump 9 and can supplement the process water, so that the point position and the accuracy of adjustment and concentration control are improved. The double-shaft stirrer 4 is used for stirring uniformly, and after the fly ash pipeline conveying mixed slurry with qualified concentration and granularity range parameters is prepared, the fly ash pipeline conveying mixed slurry is sent to a slurry storage tank 5 with a double-shaft stirring mechanism 501 for storage and waiting for pipeline conveying.
If the terminal slurry conveyed by the pipeline needs to be dewatered and then buried, a terminal filtrate collecting tank 11 is arranged to receive the filtrate returned by the terminal, the bottom of the terminal filtrate collecting tank 11 is connected with a filtrate metering pump 13, and the filtrate is returned to the double-shaft stirrer 4 for preparing the mixed slurry; a filtrate tank water replenishing metering pump 12 for replenishing process water to the terminal filtrate collecting tank 11 is arranged on a pipeline between the process water tank 6 and the terminal filtrate collecting tank 11; outlet pipes of the double-shaft stirrer 4 and the slurry storage tank 5 are provided with concentration meters for online detection and flow meters.
The mixed slurry preparation system further comprises a control device, as shown in fig. 1 and 2, the control device comprises a control box 21 with a control panel, a first concentration meter 10 arranged on a slurry outlet pipe 401, a second concentration meter 14 arranged at a discharge port of the slurry storage tank 5, a first liquid level meter 400 arranged at the top of an inner cavity of the double-shaft stirrer 4, a second liquid level meter 500 arranged at the top of the inner cavity of the slurry storage tank 5 and an automatic sampling device 25 arranged on the double-shaft stirrer 4; the signal output ends of the first concentration meter 10, the second concentration meter 14, the first liquid level meter 400 and the second liquid level meter 500 are connected with the signal input end of the control box 21, and the signal output end of the control box 21 is connected with the signal input ends of the first water adding metering pump 7, the second water adding metering pump 8, the stirring shaft control system of the double-shaft stirrer 4 and the control system of the stirring mechanism 501 in the slurry storage tank 5. The automatic sampling device 25 is in signal connection with the control box 21. The production line is provided with a control box 21 which is connected with the equipment through a cable so as to monitor the working state and the running condition of the equipment, collect data and information and feed back and adjust the parameters of the fly ash mixed slurry in pipeline transportation, so that the fly ash mixed slurry meeting the pipeline transportation requirement is prepared. Safety protection measures are adopted in the control system to ensure safe and reliable operation of the production line.
The online first concentration meter 10 of the pipeline between the double-shaft mixer 4 and the slurry storage tank 5 is used for monitoring the discharging concentration of the double-shaft mixer 4 in real time, is connected with the control box 21 for feedback control and adjustment, and can adjust the proportion of the fly ash material, the filtrate and the process water through the feedback control of the control box 21 so as to ensure that the fly ash pipeline conveying mixed slurry concentration of the double-shaft mixing slurry storage tank 5 waiting for pipeline conveying meets the requirement. The automatic sampling device 25 of the installation of the double-shaft mixer 4 samples regularly, through the timing of control box 21 and control sampling time interval to whether the concentration and the granularity scope of the manual chemical examination meet the requirements, can calibrate at the first concentration meter 10 according to the average value of the data of the manual chemical examination. In addition, field workers can adjust the aperture of the screen of the crusher 4 manually in time according to sampling detection data, adjust the feeding amount of the fly ash and the gelatinizing agent, the filtrate and the process water in the double-shaft stirrer 4, and accurately control the concentration and the particle size range. In addition, the length of the sampling time interval can be adjusted.
The control box 21 of the present invention also performs feedback control and regulation on the device, monitors the working state and the operating condition of the device, and acquires data and information. The control contents and methods of the control box 21 include, but are not limited to: the control box 21 monitors and controls the pump outlet pressure, temperature, and valve opening. The system comprises a first water adding metering pump 7, a second water adding metering pump 8 and a filtrate tank water supplementing metering pump 12, wherein the outlet pressure and the outlet temperature are respectively measured; the control box 21 monitors and controls the liquid level of each tank. The device comprises a monitoring double-shaft stirrer 4, a slurry storage tank 5, a process water tank 6 and a terminal filtrate collecting tank 11, wherein the data of liquid level meters are arranged, and a high liquid level alarm device and a low liquid level alarm device are arranged and are interlocked with a valve and a stirrer. When receiving the high liquid level signal, the control box 21 controls the double-shaft stirrer 4 and the slurry storage tank 5 to be switched to slurry supply so as to prevent the liquid level from being too high. The control box 21 monitors, controls and adjusts the concentration and the flow rate of the mixed slurry conveyed by the fly ash pipeline. The outlet pipes of the double-shaft mixer 4 and the slurry storage tank 5 are respectively provided with an online detection concentration meter and a flowmeter to monitor the concentration, the instantaneous flow value and the accumulated flow value of the mixed slurry conveyed by the fly ash pipeline in real time, so that the supply amount for a user in a period of time can be accumulated and provided for a pipeline terminal system. The control box 21 also monitors the temperature of the mixed slurry conveyed by the fly ash pipeline in real time. The stirrers of the double-shaft stirrer 4 and the slurry storage tank 5 are both provided with temperature sensing devices. The control box 21 also monitors and controls the motor windings, bearing temperature, bus voltage and motor current of each metering pump. The system comprises a first water adding metering pump 7, a second water adding metering pump 8, a filtrate tank water adding metering pump 12, a discharging metering pump 9, a motor winding of a filtrate metering pump 13, bearing temperature, bus voltage, motor current and the like; the control box 21 performs feedback control to adjust the operation and fault states of each device and sends out alarm signals. The alarm system comprises a power failure alarm system, a power failure alarm system and a power failure alarm system.
When the device works, the gelatinizing agent with the particle size not larger than 1.2mm after being ground in the gelatinizing agent bin 27 is fed to the dry mixture screw conveyor 3 through the gelatinizing agent quantitative feeder 1; the fly ash with the particle size not larger than 1.2mm after being treated by the fly ash pretreatment system is fed to the dry mixed material screw conveyor 3 through the fly ash quantitative feeder 2, and the fly ash and the gelatinizer are primarily mixed through the dry mixed material screw conveyor 3 before entering the double-shaft mixer 4, so that the uniformity degree of the dry mixed material is improved; a double-shaft stirrer 4 is arranged below the dry mixed material screw conveyor 3, the mixture subjected to dry powder primary mixing enters the double-shaft stirrer 4, a process water tank 6 is filled with water towards the inside of the double-shaft stirrer 4 through a first water adding metering pump 7, the dry mixed material and the water are mixed together through the double-shaft stirrer 4, the double-shaft stirrer 4 is uniformly stirred, and after the fly ash pipeline conveying mixed slurry with qualified concentration and granularity range parameters is prepared, the pulverized coal mixed slurry of the double-shaft stirrer 4 is output, the weight concentration of the pulverized coal mixed slurry is controlled to be 45% -60%, the particle size of particles in the mixed slurry is not more than 1.2mm, pipeline conveying can be met, and the fly ash mixed slurry meeting the requirements is sent to a slurry storage tank 5 to be stored for pipeline conveying; carry out concentration detection to the thick liquids of discharge double-shaft mixer 4 and storage thick liquid jar 5 respectively through setting up first concentration meter 10 on play thick liquid pipe 401 and setting up the second concentration meter 14 at the discharge gate of storage thick liquid jar 5 to control the water addition volume of first water metering pump 7 and the second water metering pump 8 of adding through the rewiring detection condition, guarantee that storage thick liquid jar 5 discharged fly ash mixes the ground paste concentration and accords with the pipe-line transportation, with the position and the accuracy that increase regulation, control concentration.
The fly ash mixed slurry transported to the terminal end by a pipeline exists in two cases during filling, and the following two cases are respectively illustrated by two examples:
the first embodiment is as follows: other additives are directly added into the fly ash mixture discharged from the pipeline conveying terminal for treatment and then filling is carried out, at the moment, the fly ash mixture is conveyed to the terminal through the conveying pipeline 23 and then does not need to be dewatered, and at the moment, secondary pollution of filtrate does not exist; a subsequent dehydration process may not be required.
Example two: the fly ash mixture discharged from a pipeline conveying terminal is directly filled without adding additives, at the moment, the fly ash mixture conveyed to the terminal through a conveying pipeline 23 needs to be dewatered, the weight concentration of the dewatered fly ash mixture is more than 70%, waste filtrate can exist in the dewatering treatment process, the waste filtrate is conveyed into a terminal filtrate collecting tank 11 through a liquid discharge pipe 1900 and a liquid discharge pump 24, and then the waste filtrate can be conveyed into a double-shaft stirrer 4 again through a filtrate metering pump 13 to be recycled for preparing mixed slurry, so that the secondary pollution of the filtrate is avoided. Be equipped with the level gauge at the top of terminal filtrating holding vessel 11, can monitor terminal filtrating holding vessel 11's liquid level to in the lower condition of liquid level, carry out the moisturizing or adjust the concentration of filtrating in the terminal filtrating holding vessel 11 to monitor terminal filtrating holding vessel 11 through filtrating holding vessel moisturizing measuring pump 12.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only for the purpose of illustrating the structural relationship and principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a fly ash compounding thick liquid preparation system for pipe-line transportation which characterized in that: the mixed slurry preparation system comprises a gelatinizing agent constant feeder (1), a coal ash constant feeder (2), a dry mixture screw conveyor (3), a double-shaft mixer (4), a slurry storage tank (5) and a constant water adding system, wherein discharge ports of the gelatinizing agent constant feeder (1) and the coal ash constant feeder (2) are respectively communicated with a feed port of the dry mixture screw conveyor (3), an outlet of the dry mixture screw conveyor (3) is communicated with the double-shaft mixer (4), a discharge port of the double-shaft mixer (4) is communicated with a feed port of the slurry storage tank (5) through a slurry outlet pipe (401), a discharge metering pump (9) is arranged on the slurry outlet pipe (401), and a stirring mechanism (501) is arranged in the slurry storage tank (5); the quantitative water adding system comprises a process water tank (6), a first water adding metering pump (7) and a second water adding metering pump (8), wherein the process water tank (6) leads to a water adding port of the double-shaft stirrer (4) through the first water adding metering pump (7), the process water tank (6) is communicated with a slurry outlet pipe (401) of the double-shaft stirrer (4) through the second water adding metering pump (8), and a connecting point of the second water adding metering pump (8) and the slurry outlet pipe (401) is arranged between the double-shaft stirrer (4) and a discharge metering pump (9).
2. The system for preparing the fly ash mixed slurry for pipeline transportation according to claim 1, characterized in that: the mixed slurry preparation system also comprises a control device, wherein the control device comprises a control box (21) with a control panel, a first concentration meter (10) arranged on the slurry outlet pipe (401), a second concentration meter (14) arranged at the discharge hole of the slurry storage tank (5), a first liquid level meter (400) arranged at the top of the inner cavity of the double-shaft stirrer (4), and a second liquid level meter (500) arranged at the top of the inner cavity of the slurry storage tank (5); the signal output ends of the first concentration meter (10), the second concentration meter (14), the first liquid level meter (400) and the second liquid level meter (500) are connected with the signal input end of the control box (21), and the signal output end of the control box (21) is connected with the signal input end of the first water adding metering pump (7), the second water adding metering pump (8), the stirring shaft control system of the double-shaft stirrer (4) and the control system signal input end of the stirring mechanism (501) in the slurry storage tank (5).
3. The system for preparing the fly ash mixed slurry for pipeline transportation according to claim 2, characterized in that: the slurry preparation system further comprises a terminal fly ash mixed slurry dehydration device (19) and a terminal filtrate circulating device, wherein the terminal filtrate circulating device comprises a terminal filtrate collecting tank (11) and a filtrate tank water supplementing metering pump (12), and a third liquid level meter (1100) is arranged in the terminal filtrate collecting tank (11); the fly ash mixed slurry discharged from the slurry storage tank (5) is conveyed to a terminal fly ash mixed slurry dewatering device (19) through a conveying pipeline (23) for dewatering treatment, a filtrate discharge port of the fly ash mixed slurry dewatering device (19) is communicated with a terminal filtrate collection tank (11) through a drain pipe (1900), and a drain pump (24) is arranged on the drain pipe (1900); a water outlet of the terminal filtrate collecting tank (11) is communicated with a water inlet of the double-shaft stirrer (4) through a filtrate metering pump (13), and the process water tank (6) is communicated with a water inlet of the terminal filtrate collecting tank (11) through a filtrate tank water replenishing metering pump (12); and a signal output end of the third liquid level meter (1100) is connected with a signal input end of the control box (21), and a signal output end of the control box (21) is connected with a control end of the filtrate tank water replenishing metering pump (12).
4. A system for preparing a fly ash mixed slurry for pipeline transportation according to claim 1, 2 or 3, characterized in that: the slurry preparation system further comprises a fly ash pretreatment system, the fly ash pretreatment system comprises a fly ash raw material bin (26), a crusher (15), a pulverizer (16), a scraper conveyor (17) and a fly ash buffer bin (18), a belt conveyor (22) is arranged at a feed inlet of the fly ash raw material bin (26), a feeding belt (20) is arranged below a discharge outlet, a discharge end of the feeding belt (20) is communicated with the feed inlet of the crusher (15) through a chute, the pulverizer (16) is arranged below the crusher (15), the feed inlet of the crusher is butted with the discharge outlet of the crusher (15), the feed inlet of the scraper conveyor (17) is arranged below the discharge outlet of the pulverizer (16), the fly ash treated by the pulverizer (16) is conveyed into a fly ash buffer bin (18) through a scraper conveyor (17), the feeding hole of the fly ash quantitative feeder (2) is arranged below the discharging hole of the fly ash buffer bin (18).
5. A system for preparing a fly ash mixed slurry for pipeline transportation according to claim 2 or 3, characterized in that: a stirring mechanism (501) in the slurry storage tank (5) adopts double-shaft stirring; an automatic sampling device (25) is arranged on the double-shaft stirrer (4), and the automatic sampling device (25) is in signal connection with the control box (21).
6. A preparation process of fly ash mixed slurry for pipeline transportation is characterized by comprising the following steps:
(1) respectively adding 75-90% of fly ash and 10-25% of gelling agent into a dry mixing screw conveyor according to mass percent through a fly ash quantitative feeder and a gelling agent quantitative feeder to mix; the grain size of the fly ash and the gelling agent is not more than 1.2mm, and the gelling agent is any one or a mixture of more of quicklime, water glass, magnesium materials, cement and resin;
(2) conveying the fly ash dry powder mixture uniformly mixed by the dry mixing screw conveyor in the step (1) to a double-shaft stirrer, adding water, uniformly mixing and stirring, preparing fly ash mixed slurry with the weight concentration of 45-60%, and conveying the fly ash mixed slurry to a slurry storage tank; the mixing water is added and is equipped with two water points, and first water point setting is at the water inlet of double-shaft mixer, and the second water point setting is between double-shaft mixer and storage thick liquid jar to through two water points control storage thick liquid jar discharged fly ash mix the weight concentration of ground paste 45% -60%, mix in the ground paste granule particle size and be not more than 1.2 mm.
7. The process for preparing fly ash mixed slurry for pipeline transportation according to claim 6, wherein the preparation process further comprises recycling the end filtrate, and the specific process is as follows: conveying the fly ash mixed slurry with the weight concentration of 45-60% discharged from the slurry storage tank to a terminal through a pipeline, forming fly ash mixed slurry with the weight concentration of more than 70% through dehydration treatment, wherein the fly ash mixed slurry can be directly used for underground filling, and filtrate after the dehydration treatment is collected into a terminal filtrate collection tank and returns to a double-shaft stirrer through a filtrate metering pump to be repeatedly used for preparing the fly ash mixed slurry.
8. The process according to claim 7, wherein the fly ash mixed slurry for pipeline transportation comprises: the preparation process also comprises an automatic water adding control process, wherein online concentration meters are arranged on a connecting pipeline between the double-shaft stirrer and the slurry storage tank and a slurry outlet of the slurry storage tank, liquid level meters are arranged at the tops of the double-shaft stirrer, the slurry storage tank and the terminal filtrate collecting tank, and process water is provided for the whole system through a process water tank; a first water adding metering pump is arranged between the process water tank and the double-shaft stirrer and serves as a first water adding point, a second water adding metering pump is arranged on a connecting pipe between the double-shaft stirrer and the slurry storage tank and serves as a second water adding point, the second water adding point is arranged between the double-shaft stirrer and the discharge metering pump, and a filtrate tank water supplementing metering pump is arranged between the process water tank and the terminal filtrate collection tank and serves as a water supplementing point; the concentration of the mixed slurry of the fly ash discharged by the double-shaft stirrer and the slurry storage tank is respectively monitored by the online concentration meters of the connecting pipeline between the double-shaft stirrer and the slurry storage tank and the slurry outlet of the slurry storage tank, the liquid level meters of the double-shaft stirrer, the slurry storage tank and the terminal filtrate collection tank respectively monitor the liquid level in the corresponding cavity, and according to the concentration monitored online and the liquid level conditions in different cavities, the first water adding metering pump, the second water adding metering pump and the filtrate tank water supplementing metering pump are controlled to add water, so that the final concentration of the mixed slurry of the fly ash is controlled to be 45% -60%.
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