CN110540880A - Sludge water-coal slurry preparation method and stokehole slurry preparation system - Google Patents
Sludge water-coal slurry preparation method and stokehole slurry preparation system Download PDFInfo
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- CN110540880A CN110540880A CN201910842220.1A CN201910842220A CN110540880A CN 110540880 A CN110540880 A CN 110540880A CN 201910842220 A CN201910842220 A CN 201910842220A CN 110540880 A CN110540880 A CN 110540880A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8361—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating
- B01F33/83613—Mixing plants; Combinations of mixers combining mixing with other treatments with disintegrating by grinding or milling
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/32—Liquid carbonaceous fuels consisting of coal-oil suspensions or aqueous emulsions or oil emulsions
- C10L1/326—Coal-water suspensions
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Abstract
Providing a sludge coal water slurry preparation method and a stokehole pulping system which can obtain low-cost and high-efficiency consumption treatment of excess sludge after sewage treatment, preparing granular crushed coal with the particle diameter of less than 50mm in advance, and calculating the weight ratio of the granular crushed coal to the sludge according to the water content of the sludge; continuously shearing granular crushed coal and sludge into small granules with the diameter of 1mm to 5mm according to the calculated mixture ratio, and simultaneously mixing the granular crushed coal and the sludge to prepare sludge coal water slurry consisting of 65 percent to 70 percent of solid granules and 30 percent to 35 percent of water; the mesh structure of the sludge flocculant is thoroughly destroyed by high-speed shearing, so that water in the sludge is fully separated out, the particle size can be manually controlled, no superfine powder is generated, the ideal and consistent particle size is achieved, and the produced coal water slurry is more suitable for combustion of a fluidized bed boiler; the stokehole pulping system can also save the transportation and storage cost and the influence on the surrounding environment.
Description
Technical Field
The invention belongs to the technical field of sludge treatment and the technical field of coal water slurry pulping, and particularly relates to a sludge coal water slurry preparation method and a stokehole pulping system, which can obtain residual sludge after sewage treatment by a sewage treatment plant which is difficult to properly treat at present with low cost and high-efficiency consumption treatment.
Background
With the rapid development of industry and the increasing urban population, the discharge amount of urban sewage is increased unprecedentedly. At present, the number of municipal sewage treatment plants in China breaks through 2000.
In the sewage treatment, a flocculating agent is added into sewage to flocculate and precipitate harmful substances in the sewage into residual sludge after sewage treatment, so that normally usable water can be separated out and enter a water resource system capable of being normally used. A large amount of sludge is generated in the sewage treatment process, and if the sludge is directly discharged into the external environment without scientific treatment, the sludge can pollute the ground water, soil, underground water and air. In 2010-2017, the sludge production in China is increased from 5427 ten thousand tons to 7436 ten thousand tons, the annual growth rate is 4.6 percent, and the sludge produced by a large amount of industrial wastewater is listed as dangerous waste. At present, the sludge treatment modes in China mainly comprise modes of landfill, composting, drying, incineration and the like, and the four treatment methods are 65%, 15%, 6% and 3% in percentage. It can be seen that the sludge treatment mode in China is mainly landfill, which directly causes secondary pollution and seriously threatens the ecological environment. Therefore, the harmless treatment, especially the resource treatment of the sludge is a problem which needs to be solved urgently in China and is highly valued by governments at all levels. The major scientific and technological specialization of the science and technology department in 2019 ranks resource utilization of solid wastes as the first item, and sludge treatment is the main part of the resource utilization.
The fine structure of the excess sludge after the sewage treatment is a flocculation network structure as shown in fig. 21. The percentage of the weight of the water contained in the sludge to the total weight of the sludge is called the sludge water content. The water in the sludge exists in the forms of interstitial water, capillary water, surface adsorption water and internal combination water. Interstitial water, free water in the interstitial spaces of the particles, about 70%, can be separated by gravity precipitation (concentration compaction); the surface adsorbed water, about 5%, is the water attached to the surface of sludge particles, has strong adhesive force, is usually present on the solid surfaces of colloidal particles, biological sludge and the like, adopts a coagulation method, removes the water attached to the surface by mutual flocculation of the colloidal particles, and can be removed by a biological separation or thermal method. The internally bound water, about 5%, is the moisture bound inside the sludge particles, such as the moisture inside cells in biological sludge, crystal water carried by metal compounds in inorganic sludge, and the like, and can be removed by biological separation or thermal methods. When the water content is more than 85%, the sludge is in a fluid state; the plastic state is formed when 65% -85%; below 60% it is solid.
In the current sludge treatment mode, direct landfill is gradually prohibited. Biodegradation is one of the modes widely researched and practiced at present, but the biodegradation has the problems of low economy, non final treatment scheme and difficult treatment and secondary pollution caused by residual wastes. The compost utilization causes pollution to soil due to the problems of excessive heavy metals and the like. Therefore, drying and incineration become the main encouragement direction. The initial sludge water content of the sewage treatment plant is over 98 percent, and the initial sludge water content can be reduced to 80 percent at most through mechanical pressing treatment. The stable incineration treatment can be realized only by high-temperature drying treatment. A large amount of energy is consumed, the treatment cost is more than 500 yuan per ton, and the main problem of drying incineration is high cost, so that the drying incineration becomes a heavy burden for various levels of finance and related enterprises. The drying incineration has another problem of secondary pollution, because the sludge is more harmful, the heat value is low, the combustion temperature is low, harmful substances such as dioxin and the like can be generated, in addition, in the drying and storage and transportation processes, the sludge is easily pulverized, the water content and the temperature are not well controlled, the spontaneous combustion of the dried sludge can be caused, and the fine sludge particles are also easily blown to cause environmental pollution, so the popularization and the application of various waste incineration plants including the incineration sludge are severely limited.
Another current mode of sludge treatment is that the sludge is dried and then mixed with coal to be combusted in a boiler. Because the modern boiler has a perfect dedusting and tail gas treatment system, and simultaneously, harmful substances such as dioxin and the like are fully decomposed by utilizing the high-temperature combustion of the boiler, the generation of secondary pollution is basically avoided. The method has the disadvantages of high cost, energy consumption for drying the sludge far higher than heat generated by sludge combustion, total cost for treating the sludge by the method about 300 yuan per ton, and safety and environmental problems of spontaneous combustion, pulverization and the like. Therefore, the problem to be solved urgently is to explore a new sludge treatment technology with low cost, resource and no secondary pollution.
China is a country with more coal and less oil, and coal accounts for about 75% of the production and consumption of primary energy. The energy structure mainly based on coal is not expected to change in the future 30-50 years. At present, most areas in China are puzzled by soot type pollution, and the environmental protection problem needs to be solved urgently. The development of clean coal technology has made it urgent to greatly promote clean combustion of coal.
Coal water slurry is a coal-based fluid fuel obtained by physical processing and is prepared by mixing about 65% coal (including additives) and 35% water. The coal water slurry has the advantages of high combustion efficiency, environmental protection and energy saving. The technical research work of the coal water slurry in China starts in the period of 'six five', and through more than 30 years of technical research and practice, China already has a mature coal water slurry preparation and application industrial system. As a clean coal fuel, the application of the coal water slurry has great superiority and has a prominent position in the national 'clean coal' technology.
The method for preparing the coal water slurry by mixing the sludge and the granular crushed coal is an advanced treatment method which achieves two purposes at present, harmlessly consumes the sludge, fully utilizes water resources in the sludge and energy of combustible organic matters in the sludge, does not need to add water during pulping, and saves normal water resources. However, the fine structure of the sludge is a flocculation net structure, and the sludge can be automatically agglomerated into small and large agglomerated masses when being directly mixed with the particle crushed coal, so that the internal water content is very high, and the sludge cannot be burnt out along with the particle crushed coal if the sludge is not effectively decomposed. The main problems of preparing coal water slurry by sludge at present are as follows: the sludge treated by the flocculating agent has high viscosity, and the net structure of the flocculating agent is difficult to be fully mixed with the coal water slurry, so that the viscosity of the slurry is greatly improved. The sludge contains a large amount of internal water, so that the concentration and the heat value of the sludge coal water slurry are reduced, the combustion of organic matters in the sludge is prevented, the coal water slurry prepared from the sludge cannot be fully combusted, the proportion of the sludge consumed by the coal water slurry is greatly limited, and the optimal effect of sludge energy utilization cannot be achieved. In the ball mill pulping system that generally uses at present, generally add mud and particle crushed coal together and grind the mixture slurrying in the ball mill, the flocculation network structure of mud can't be destroyed usually to the ball mill, also can't utilize interior water (the majority is cell water) in the mud, and mud can be reunited into the very high conglomeration piece of inside moisture content greatly little by oneself, can cause the misce bene, can not reach the slurry fuel of good performance. For the reasons, the sludge is generally pretreated by chemical methods (such as calcium oxide addition) and physical methods (such as ultrasonic decomposition) at present, for example, the methods disclosed in chinese patent documents CN107022387A and CN106916612A, the treatment method has high cost, and the flocculation network structure of the sludge is not completely decomposed, so the effect is not ideal, the sludge treatment amount is limited, the economic benefit of preparing the coal water slurry from the sludge is influenced, and the popularization and application of the technology are limited. In addition, the traditional ball mill and rod mill are used for pulping by collision crushing, the equipment volume is large, a large amount of power is consumed, the main cost of pulping is high, and meanwhile, the ball mill and the rod mill are difficult to damage the mesh structure of the sludge flocculant and influence the precipitation of water in sludge. The other problem of the pulping of the ball mill and the rod mill is that the collision crushing cannot be carried out, the particle size cannot be manually controlled, and a large amount of micron-sized ultrafine powder is generated, so that the problem of difficult coal powder separation during the combustion in a fluidized bed cannot be solved.
In addition, the existing coal water slurry plants are all independently arranged, generally adopt a large-scale ball mill or a rod mill to perform collision crushing pulping, not only is the equipment volume large and the power consumption large, but also often because of the historical reasons of social development, the mixing of sludge and particle crushed coal into coal water slurry is a new technology, and the urban planning does not take the coal water slurry and a sewage treatment plant as industrial related enterprises to plan, so the distances among the coal water slurry plants and the sewage treatment plant are often far, coal needs to be sent to the coal water slurry plants and then sent to the coal water slurry plants, dirty and smelly sludge is transported to the coal water slurry plants from the sewage treatment plant, a large amount of transportation and storage cost needs to be generated, and the surrounding environment is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for preparing the sludge coal water slurry, which can efficiently consume and treat the residual sludge after the sewage treatment by the sewage treatment plant which is difficult to treat at low cost aiming at the technical current situation; meanwhile, the stokehole pulping system adopting the preparation method is provided, and the excess sludge after sewage treatment can be efficiently consumed and treated at low cost.
The method for preparing the sludge coal water slurry for solving the technical problems adopts the technical scheme that:
A method for preparing sludge coal water slurry, the said sludge is the excess sludge after sewage treatment of sewage treatment plant, break the coal briquette into the granular crushed coal below 50mm of particle diameter with the breaker in advance, characterized by, according to the moisture content of the sludge and moisture content of the sludge coal water slurry of goal, calculate the weight proportion of granular crushed coal and sludge; and continuously feeding the granular crushed coal and the sludge into a feed inlet of a coal slurry crusher according to the calculated ratio, shearing the granular crushed coal and the sludge into small granules with the diameter of 1mm to 5mm by a crushing part of the coal slurry crusher in the operation process of the coal slurry crusher, simultaneously mixing the granular crushed coal and the sludge, and discharging the mixture from a discharge port of the coal slurry crusher to a sludge water coal slurry collecting container, thereby preparing the sludge water coal slurry consisting of 65 percent to 70 percent of solid granules and 30 percent to 35 percent of water.
The further scheme of the sludge coal water slurry preparation method is as follows:
The crushing component of the coal slurry crusher comprises a cylinder body (1) and a rotor (2) which can be driven by a rotating shaft of the cylinder body (1) to rotate, the lower side area of the cylinder wall of the cylinder body (1) is a screen (5) area used for discharging crushed materials, the screen (5) area is full of meshes (6) with the aperture suitable for discharging the crushed materials, a plurality of raised fixed teeth (7) are arranged on the inner wall of the cylinder body (1) except the screen (5) area, the raised fixed teeth (7) are arranged in a plurality of rows at intervals along the circumference of the inner wall of the cylinder body (1), each row comprises a plurality of raised fixed teeth (7) which are vertically arranged along the inner wall of the cylinder body (1), and a vacant section (8) is arranged between every two adjacent rows of raised fixed teeth (7) to serve as a space required by material movement; the periphery of the rotor (2) is provided with a plurality of raised rotary teeth (9), the raised rotary teeth (9) are arranged in at least 2 rows along the periphery of the rotor (2), each row comprises a plurality of raised rotary teeth (9) vertically arranged along the periphery of the rotor (2), and a hollow groove (23) is arranged between every two adjacent rows of raised rotary teeth (9) and serves as a space required by material movement; a plurality of protruding rotating teeth (9) on the periphery of the rotor (2) are meshed with a plurality of protruding fixed teeth (7) arranged on the inner wall of the barrel body (1), grooves (22) which are mutually embedded into each other are formed between every two protruding fixed teeth (7) or every two protruding rotating teeth (9), and spaces required by the size of target particles of materials are reserved between the protruding rotating teeth (9) and the protruding fixed teeth (7) which are meshed with each other; the granular crushed coal and the sludge are sheared into small granules with the diameter of 1mm to 5mm by mutually meshed raised rotary teeth (9) and raised fixed teeth (7) in a crushing part of the coal slurry crusher, and the small granules are discharged to a sludge water coal slurry collecting container from a discharge port of the coal slurry crusher after being thrown out by meshes (6) in a screen (5) area.
Shearing the granular crushed coal and the sludge into small granules with the diameter of 1mm to 2 mm.
When the sludge is in a fluid state with the water content of 85 to 95 percent, the weight ratio of the granular crushed coal to the sludge is 1 to 0.460 to 0.585.
When the sludge is plastic sludge with the water content of 75-85%, the weight ratio of the granular crushed coal to the sludge is 1: 0.670-0.875.
The coal slurry pulverizer comprises a feed inlet (31), a feeding part, a pulverizing part and a discharge outlet (36) which are sequentially connected, wherein the feeding part comprises a screw conveyor (29) driven by a first motor (27) and a first outer sleeve (30) sleeved outside the screw conveyor, and the first outer sleeve (30) is provided with the feed inlet (31) with an upward opening; the crushing component comprises a barrel (1) and a rotor (2) which is arranged in the barrel (1) and driven by a second motor (28), a chassis (15) is arranged at the end, where the bottom surface of the rotor (2) is located, of the barrel (1), and a shaft sealing device (16) is arranged on the outer side of the chassis (15).
The screw conveyor (29) comprises a sleeve (33) and a spiral rib (34) spirally surrounding the sleeve (33), and the sleeve (33) is fixedly sleeved outside the shaft of the first motor (27).
The second motor (28) is fixedly arranged on the machine table (35), the shaft of the second motor (28) is connected with the rotating shaft (4) through the coupling (18), the rotating shaft (4) is at least provided with one bearing (17), and the rotating shaft (4) penetrates through the shaft sealing device (16) and the chassis (15) to be connected with the rotor (2); the rotor (2) is provided with a shaft hole (3) and is fixedly sleeved on the rotating shaft (4) through a connecting key; a water through hole is formed in the outer side of the shaft sealing device (16) and a water through pipe (37) is connected; a second outer sleeve (24) is sleeved outside the barrel (1), and a discharge hole (36) with a downward opening is formed in the second outer sleeve (24) below the screen (5) area.
The cross sections of the protruding fixed teeth (7) and the protruding rotating teeth (9) are triangular, trapezoidal or rectangular, and the cross sections of the grooves (22) which are mutually corresponding to each other and embedded between every two 2 protruding fixed teeth (7) or every two 2 protruding rotating teeth (9) are also corresponding triangular, trapezoidal or rectangular.
The meshing distances between all the mutually meshed convex rotating teeth (9) and the convex fixed teeth (7) are consistent and are the distances required by the target particle size of the material.
The stokehole pulping system for solving the technical problems adopts the technical scheme that:
The on-site slurry preparation system adopting the sludge water-coal slurry preparation method is characterized by sequentially comprising a coal slurry crusher, a water-coal slurry tank, a conveying pump and a vertical fluidized bed boiler according to the treatment process, wherein the coal slurry crusher comprises a feed inlet (31), a crushing part and a discharge outlet (36), the discharge outlet (36) of the coal slurry crusher is connected with a water-coal slurry collecting container, the water-coal slurry container is connected with the water-coal slurry tank through the conveying pipe, and the water-coal slurry tank is connected with a feed inlet of the vertical fluidized bed boiler through the conveying pump and the conveying pipe.
The following is a further scheme of the stokehole pulping system of the invention:
A crusher is arranged in front of the coal slurry crusher and is used for crushing coal blocks into particle crushed coal with the particle diameter of less than 50 mm.
The coal slurry crusher is provided with a coal slurry collecting container to receive a discharge port of the coal slurry crusher, and the coal slurry pool is lower than the coal slurry container.
A front mixing container is arranged above a feed port (31) of the coal slurry pulverizer, a stirrer is arranged above the front mixing container and used for synchronously and continuously or synchronously adding the granular pulverized coal and the sludge at intervals, and an opening is formed in the lower end of the front mixing container and communicated with the feed port (31) of the coal slurry pulverizer.
The sludge water coal slurry preparation method and the stokehole pulping system can realize low-cost and high-efficiency consumption treatment of the residual sludge after sewage treatment which is difficult to be properly treated at present, and can realize clean, thorough, high-efficiency and harmless consumption treatment of the residual sludge after sewage treatment. Because the coal slurry crusher is adopted to cut, crush and pulp, the power consumption is greatly reduced. Because the high-speed shearing action of the convex rotating teeth and the convex fixed teeth of the crushing part of the coal slurry crusher can thoroughly destroy the mesh structure of the sludge flocculant, so that water in sludge is fully separated out, meanwhile, the novel pulping equipment does not produce ultrafine powder, the particle size distribution is uniform and consistent, the particle size can be manually controlled, ideal and consistent particle sizes are reached, and the produced coal water slurry is more suitable for the combustion of a fluidized bed boiler. The scheme of the stokehole pulping system can also save a large amount of transportation and storage cost and reduce the influence of the transportation and storage cost on the surrounding environment. Therefore, the invention has good social benefit and economic benefit. Is worthy of popularization and application.
The method for preparing the sludge coal water slurry can adopt the scheme of a horizontal coal slurry crusher with the patent application number of 201910423269.3 of the applicant. The horizontal coal slurry crusher mainly utilizes the cutting side of the raised rotating teeth on the periphery of the rotor and the raised fixed teeth on the inner wall of the cylinder to effectively shear the material with constant cutting depth, and the distance between the mutually meshed raised rotating teeth and the raised fixed teeth becomes the size of target particles reserved by the sheared material. Because the raised fixed teeth are arranged in a plurality of rows at intervals along the circumference of the inner wall of the cylinder body, each row comprises a plurality of raised fixed teeth which are vertically arranged along the inner wall of the cylinder body, and a vacant section is arranged between every two adjacent rows of raised fixed teeth to serve as a space required by forward movement of materials; the periphery of the rotor is provided with a plurality of raised rotary teeth, the raised rotary teeth are arranged in at least 2 rows along the periphery of the rotor, each row comprises a plurality of raised rotary teeth vertically arranged along the periphery of the rotor, and a vacant groove is arranged between every two adjacent 2 rows of raised rotary teeth to serve as a space required by forward movement of materials; the materials which are not cut into the target granularity on the upper surface move to the positions of the convex rotating teeth and the convex fixed teeth on the rear surface through the vacant space to be continuously sheared, and the materials which are not cut into the target granularity can move forwards through the vacant space or directly fall from meshes of the screen area and are rarely sheared repeatedly; the material of the crushing component device is rarely subjected to the effects of rolling, impact (striking) and grinding force except shearing; therefore, the material crushed by the crushing component device is uniform in particle size. The crushing component device has reasonable internal structure, small equipment volume and high efficiency, and the crushing efficiency is far higher than that of the impact coal slurry crushing equipment in the prior art. The slurry making system in front of the sludge water coal slurry furnace has the outstanding advantages of integration, miniaturization, localization and the like.
Drawings
FIG. 1 is a schematic view of the overall appearance of a horizontal coal slurry pulverizer used in the present invention.
FIG. 2 is a schematic sectional view of a main portion of a horizontal coal slurry pulverizer used in the present invention.
FIG. 3 is a schematic view of the horizontal coal slurry pulverizer of the present invention with the outer sleeve hidden.
FIG. 4 is a schematic diagram showing the horizontal coal slurry pulverizer of the present invention in a partially separated state in which 2 motors are driven individually.
Fig. 5 is a perspective view of the crushing member.
Fig. 6 is a perspective view of the screw conveyor.
Fig. 7 is a perspective view of the cartridge.
FIG. 8 is a schematic view of a half-circumference portion of a cylinder having a raised set teeth on the inner wall.
Fig. 9 is a schematic view of a half circumference of a cylinder provided with a screen area.
Fig. 10 is a perspective view illustrating an assembled state of the rotor, the chassis, and the shaft seal.
FIG. 11 is a schematic view of a helical rotor.
Fig. 12 is a schematic bottom view of a helical rotor.
fig. 13 is a schematic top view of a cylindrical rotor provided with 3 concentric circular arc surface bumps.
Fig. 14 is a schematic top view of a cylindrical rotor provided with 4 concentric circular arc surface bumps.
FIG. 15 is a schematic view of a half circumference of a cylinder with rectangular teeth.
FIG. 16 is a schematic view of a rectangular tooth helical rotor.
FIG. 17 is a process diagram of the method for preparing sludge coal water slurry according to the invention.
FIG. 18 is a schematic view of a stokehole pulping system of the present invention.
FIG. 19 is a schematic view of a stokehold pulping system provided with a mixing vessel.
FIG. 20 is a schematic view of a stokehole pulping system with a crusher and mixing vessel.
FIG. 21 is an enlarged view of the microstructure of sludge.
Detailed Description
the following description will use a horizontal coal slurry pulverizer shown in fig. 1 to 16 as an example, and combines a pulping process block diagram shown in fig. 17 and a stokehole pulping system schematic diagram shown in fig. 18 to 20 to describe a specific embodiment of the present invention.
As shown in fig. 1, 2 and 3, a horizontal coal slurry pulverizer comprises a feed inlet 31, a feeding part, a pulverizing part and a discharge outlet 36 which are connected in sequence, wherein the feeding part comprises a screw conveyor 29 driven by a first motor 27 and a first outer sleeve 30 sleeved outside the feeding part, and the first outer sleeve 30 is provided with the feed inlet 31 with an upward opening; the crushing component comprises a barrel body 1 and a rotor 2 which is positioned in the barrel body 1 and driven by a second motor 28, wherein the barrel body 1 is provided with a chassis 15 at the end of the bottom surface of the rotor 2, and a shaft sealing device 16 is arranged outside the chassis 15.
As shown in fig. 2, 5 and 7, the lower area of the cylinder wall of the cylinder 1 is a screen 5 area for discharging the crushed material, and the screen 5 area is full of meshes 6 with apertures suitable for discharging the crushed material. As shown in fig. 7, 8 and 9, a plurality of protruding fixed teeth 7 are arranged on the inner wall of the barrel 1 except the screen 5 region, the protruding fixed teeth 7 are arranged in a plurality of rows at intervals along the circumference of the inner wall of the barrel 1, each row comprises a plurality of protruding fixed teeth 7 vertically arranged along the inner wall of the barrel 1, and a vacant section 8 is arranged between every two adjacent rows of protruding fixed teeth 7 as a space required for moving materials.
As shown in fig. 11 and 12, a plurality of protruding teeth 9 are provided on the outer periphery of the rotor 2, and at least 2 rows of the protruding teeth 9 are provided along the outer periphery of the rotor 2, and from the viewpoint of both the practical effect and the manufacturability, it is preferable to provide 3 rows or 4 rows, and it is particularly preferable to provide 3 rows. Each row comprises a plurality of raised rotary teeth 9 vertically arranged along the periphery of the rotor 2, and a vacant groove 23 is arranged between the raised rotary teeth 9 of the adjacent 2 rows and is used as a space required by material movement. As shown in fig. 2, 4 and 5, a plurality of protruding rotary teeth 9 on the periphery of the rotor 2 are meshed with a plurality of protruding fixed teeth 7 arranged on the inner wall of the cylinder 1, a groove 22 for mutually embedding each other is formed between every 2 protruding fixed teeth 7 or every 2 protruding rotary teeth 9, and the spaces required by the size of the target particles of the materials are reserved between the mutually meshed protruding rotary teeth 9 and the protruding fixed teeth 7.
As shown in fig. 6, the screw conveyor 29 includes a sleeve 33 and a spiral rib 34 spirally wound around the sleeve 33, and the sleeve 33 is fixedly fitted around the shaft of the first motor 27.
As shown in fig. 1, 2, and 3, for convenience of installation, a machine table 35 may be provided, the second motor 28 is fixedly installed on the machine table 35, a shaft of the second motor 28 is connected to the rotating shaft 4 through a coupling 18, the rotating shaft 4 is provided with at least one bearing 17, and the rotating shaft 4 penetrates through the shaft sealing device 16 and the chassis 15 to be connected to the rotor 2.
As shown in fig. 2 and 10, a base plate 15 is provided on the bottom surface of the rotor 2, a shaft seal device 16 is provided outside the base plate 15, and a water passage port is opened outside the shaft seal device 16 and a water passage pipe 37 is connected thereto. The rotating shaft 4 passes through the chassis 15 and the shaft sealing device 16. As shown in fig. 11 and 12, the rotor 2 is provided with a shaft hole 3 and fixedly sleeved on the rotating shaft 4 through a connecting key. As shown in fig. 1 and 2, a second outer sleeve 24 is sleeved outside the cylinder 1, and a discharge port 36 with a downward opening is formed below the screen 5 area of the second outer sleeve 24. When the horizontal coal slurry crusher works, materials are thrown to a peripheral area by using the centrifugal force generated by the rotation of the rotor 2, are sheared and crushed into the materials meeting the target particle size, are thrown out of a plurality of meshes 6 of a screen 5 under the action of the centrifugal force, and are conveyed to a material collecting appliance through the discharge hole 36; the material which does not conform to the target particle size moves under the push of the subsequent material, and is continuously sheared and crushed by the subsequent convex rotating teeth 9 and the convex fixed teeth 7. The material is sheared and crushed to a particle size corresponding to the target particle size during the movement, and is thrown out of the plurality of meshes 6 of the screen 5 by centrifugal force and flows to the material collecting device through the discharge port 36.
In summary, the horizontal coal slurry pulverizer of the present invention can be structurally divided into two parts, namely a feeding part and a pulverizing part, which have independent functions, wherein the feeding part is provided with a feeding hole 31, the pulverizing part is provided with a discharging hole 36, the feeding part is driven by a first motor 27, and the pulverizing part is driven by a second motor 28. The material is fed from the feeding port 31 and then is conveyed into the crushing part by the feeding part, and the crushed material is discharged from the discharging port 36. The horizontal coal slurry crusher is shown in FIG. 4, in which the two motors are driven separately and in a partially separated state. In addition, a third outer sleeve 20 can be additionally arranged at the exposed section of the rotating shaft 4 from the shaft sealing device 16 to the bearing 17, and a supporting foot 21 can be arranged below the third outer sleeve 20 and fixedly connected with the machine table 35.
The cross sections of the convex fixed teeth 7 and the convex rotating teeth 9 are triangular, trapezoidal or rectangular, and the cross sections of the grooves 22 which are mutually correspondingly embedded between every 2 convex fixed teeth 7 or every 2 convex rotating teeth 9 are also correspondingly triangular, trapezoidal or rectangular. The meshing intervals between all the mutually meshed convex rotating teeth 9 and the convex fixed teeth 7 are consistent and are the intervals required by the target particle size of the material.
The cross sections of the convex fixed teeth 7 and the convex rotating teeth 9 are triangular, trapezoidal or rectangular, preferably triangular. The cross section of the groove 22 which is mutually provided for the corresponding embedding of every 2 protruding fixed teeth 7 or every 2 protruding rotating teeth 9 is also in a corresponding triangle shape, trapezoid shape or rectangle shape. The meshing intervals between all the mutually meshed convex rotating teeth 9 and the convex fixed teeth 7 are consistent and are the intervals required by the target particle size of the material. The invention prefers a triangular cross-section. While fig. 15 and 16 show a rectangular cross-section, the other figures show a triangular cross-section, and a trapezoidal cross-section is also conceivable.
As shown in fig. 7, 8 and 9, the cylinder 1 includes half 2 half-circumference parts, wherein the inner wall of 1 half-circumference part is provided with a raised fixed tooth 7, and the other 1 half-circumference part is provided with a screen 5 area. The inside diameter of the mesh 6 is small and the outside diameter is large. The arrangement can effectively prevent the material from being blocked in the meshes 6 and keep the smooth discharge of the meshes 6.
As shown in fig. 13 and 14, the rotor 2 includes a cylinder and 3 or 4 convex blocks 11 which are uniformly distributed along the circumferential direction and have concentric arc surfaces on the outer sides, a space 8 required for material movement is formed between every 2 adjacent spiral convex blocks 11, and the arc surfaces on the outer sides of each convex block 11 are respectively provided with 1 row of convex rotating teeth 9 which are arranged along the vertical direction of the convex block 11.
As shown in fig. 11 and 12, the rotor 2 preferably has a spiral shape, and includes 3 or 4 spiral protrusions 11 uniformly distributed along the circumferential direction thereof, the outer circular arc surface of each spiral protrusion 11 is provided with 1 row of protruding rotating teeth 9 respectively, the protruding rotating teeth are arranged along the spiral vertical direction of the spiral protrusion 11, according to the rotating direction of the rotating shaft 4, the front side of each row of protruding rotating teeth 9 is a cutting side 12, the rear side is a non-cutting side 13, a spiral groove is formed between every 2 adjacent spiral protrusions 11 as a space 8 required for material movement, an acute angle smaller than 90 degrees is formed between the cutting side 12 of the protruding rotating teeth 9 and the spiral groove, and an obtuse angle larger than 90 degrees is formed between the non-cutting side 13 of the protruding rotating teeth 9 and the spiral groove. As shown in fig. 13, a plurality of convex ribs 14 for stirring the falling materials are arranged on the bottom surface of the rotor 2; the raised ribs 14 are arranged along their radius and are evenly spaced along their circumference. The raised ribs 14 are used for cleaning materials falling on the base plate 15, throwing the materials to the peripheral area by utilizing the centrifugal force generated by the rotation of the rotor 2, and throwing the materials which are sheared and crushed to be in accordance with the target particle size out of a plurality of meshes 6 of the screen 5 to a material collecting device by the centrifugal force; the materials which do not meet the target particle size are continuously sheared and crushed by the convex rotating teeth 9 and the convex fixed teeth 7 which are close to the lower end part of the chassis 15, and are thrown out from a plurality of meshes 6 of the screen 5 by centrifugal force and then reach a material collecting appliance through the discharge hole 36.
When the horizontal coal slurry crusher works, the first motor 27 drives the screw conveyor 29 to rotate through the gearbox 19, and materials are continuously fed from the feeding hole 31 and conveyed into the cylinder 1 through the screw conveyor 29. The second motor 28 drives the rotating shaft 4 to rotate, the materials fed into the cylinder body 1 are sheared and crushed by the raised rotating teeth 9 of the rotor 2 and the raised fixed teeth 7 on the inner wall of the cylinder body 1, the materials are sheared and crushed to meet the size of target particles, are thrown out of a plurality of meshes 6 of the screen 5 under the action of centrifugal force, and are conveyed to a material collecting device through the discharge hole 36; the material which does not conform to the target particle size is pushed by the subsequent material to move continuously, and the subsequent convex rotating teeth 9 and the convex fixed teeth 7 continue to cut and crush the material. The material is sheared and crushed to a particle size corresponding to the target particle size during the movement, and is thrown out of the plurality of meshes 6 of the screen 5 by centrifugal force and flows to the material collecting device through the discharge port 36.
As shown in fig. 17, a method for preparing sludge coal water slurry, wherein the sludge is residual sludge after sewage treatment in a sewage treatment plant, and a sufficient amount of granular crushed coal with a particle diameter of less than 50mm is prepared in advance for standby; or crushing the coal blocks into particle crushed coal with the particle diameter of below 50mm by a crusher in advance for later use; calculating the weight ratio of the granular crushed coal to the sludge according to the water content of the sludge and the water content of the target sludge coal water slurry; the method comprises the steps of continuously feeding granular crushed coal and sludge into a feed inlet of a coal slurry crusher according to a calculated ratio, shearing the granular crushed coal and the sludge into small granules with the diameter of 1mm to 5mm by a crushing part of the coal slurry crusher in the operation process of the coal slurry crusher, and simultaneously mixing the granular crushed coal and the sludge. The space required by the size of the target particles of the material is reserved between the mutually meshed convex rotating teeth 9 and the convex fixed teeth 7; the granular crushed coal and the sludge are sheared into small granules with the diameter of 1mm to 5mm by mutually meshed convex rotating teeth 9 and convex fixed teeth 7 in a crushing part of the coal slurry crusher, and the small granules are discharged from a discharge port of the coal slurry crusher to a sludge water coal slurry collecting container after being thrown out by meshes 6 in a screen 5 area, so that the sludge water coal slurry consisting of 65 percent to 70 percent of solid granules and 30 percent to 35 percent of water is prepared. The barrel 1 and the rotor 2 with smaller space between the convex rotating teeth 9 and the convex fixed teeth 7 are manufactured by adjustment or design; the particle crushed coal and the sludge can be sheared into small particles with the diameter of 1mm to 2mm, so that the sludge coal water slurry has better combustion effect.
When the sludge is in a fluid state with the water content of 85 to 95 percent, the weight ratio of the granular crushed coal to the sludge is 1 to 0.46 to 0.70. If the water content of the sludge is 85%, the weight ratio of the granular crushed coal to the sludge is 1: 0.55-0.70. The sludge coal-water slurry consisting of 65 to 70 percent of solid particles and 30 to 35 percent of water can be prepared. If the sludge is fluid sludge with water content of 90%, the weight ratio of the granular crushed coal to the sludge is 1: 0.50-0.64. The sludge coal-water slurry consisting of 65 to 70 percent of solid particles and 30 to 35 percent of water can be prepared. If the sludge is in a fluid state with the water content of 95 percent, the weight ratio of the granular crushed coal to the sludge is 1: 0.460-0.585. The sludge coal-water slurry consisting of 65 to 70 percent of solid particles and 30 to 35 percent of water can be prepared.
When the sludge is plastic sludge with the water content of 75-85%, the weight ratio of the granular crushed coal to the sludge is 1: 0.550-0.875. If the water content of the sludge is 75%, the weight ratio of the granular crushed coal to the sludge is 1: 0.670-0.875; if the water content of the sludge is 80%, the weight ratio of the granular crushed coal to the sludge is 1: 0.60-0.78; if the water content of the sludge is 85%, the weight ratio of the granular crushed coal to the sludge is 1: 0.55-0.70. The sludge coal-water slurry consisting of 65 to 70 percent of solid particles and 30 to 35 percent of water can be prepared.
As shown in figure 18, the system for preparing the sludge water-coal slurry in the front of the boiler can be used for efficiently consuming and treating the residual sludge after sewage treatment at low cost, and sequentially comprises a coal slurry crusher, a water-coal slurry tank, a delivery pump and a vertical fluidized bed boiler according to the treatment process, wherein the coal slurry crusher comprises a feed inlet 31, a crushing part and a discharge outlet 36, and the discharge outlet 36 of the coal slurry crusher is connected with a water-coal slurry collecting container. The coal slurry crusher can be provided with a coal slurry collecting container to receive the discharge hole of the coal slurry crusher. The water-coal-slurry container is connected with a water-coal-slurry pool through a conveying pipe, and the water-coal-slurry pool is connected with a feed inlet of the vertical fluidized bed boiler through a conveying pump and the conveying pipe. The transfer pump may employ the applicant's application number: 201910075221.8 application date: 2019-01 is named as a rotor pump for conveying solid-liquid double phases. The water-coal-slurry pool is lower than the water-coal-slurry container. As shown in fig. 20, a crusher may be provided in front of the coal slurry pulverizer to crush the coal briquettes into crushed coal granules having a particle diameter of 50mm or less.
As shown in fig. 19 and 20, a pre-mixing container is arranged above the feed port 31 of the coal slurry pulverizer, a stirrer is arranged above the pre-mixing container and used for synchronously and continuously or synchronously and intermittently adding granular pulverized coal and sludge, and an opening is arranged at the lower end of the pre-mixing container and communicated with the feed port 31 of the coal slurry pulverizer.
Claims (10)
1. A method for preparing sludge coal water slurry, the sludge is residual sludge after sewage treatment by a sewage treatment plant, and enough granular crushed coal with the particle diameter of below 50mm is prepared in advance for standby; or crushing the coal blocks into particle crushed coal with the particle diameter of below 50mm by a crusher in advance for later use; the method is characterized in that the weight ratio of the granular crushed coal to the sludge is calculated according to the water content of the sludge and the water content of the target sludge coal-water slurry; and continuously feeding the granular crushed coal and the sludge into a feed inlet of a coal slurry crusher according to the calculated ratio, shearing the granular crushed coal and the sludge into small granules with the diameter of 1mm to 5mm by a crushing part of the coal slurry crusher in the operation process of the coal slurry crusher, simultaneously mixing the granular crushed coal and the sludge, and discharging the mixture from a discharge port of the coal slurry crusher to a sludge water coal slurry collecting container, thereby preparing the sludge water coal slurry consisting of 65 percent to 70 percent of solid granules and 30 percent to 35 percent of water.
2. The sludge water coal slurry preparation method as claimed in claim 1, wherein the crushing component of the coal slurry crusher comprises a cylinder (1) and a rotor (2) which can be driven by a rotating shaft of the cylinder (1) to rotate, the lower side area of the cylinder wall of the cylinder (1) is a screen (5) area for discharging crushed materials, the screen (5) area is full of meshes (6) with the aperture suitable for discharging the crushed materials, a plurality of raised fixed teeth (7) are arranged on the inner wall of the cylinder (1) except the screen (5) area, the raised fixed teeth (7) are arranged in a plurality of rows at intervals along the circumference of the inner wall of the cylinder (1), each row comprises a plurality of raised fixed teeth (7) which are vertically arranged along the inner wall of the cylinder (1), and a vacant section (8) is arranged between the adjacent 2 rows of raised fixed teeth (7) to be used as a space for moving the materials; the periphery of the rotor (2) is provided with a plurality of raised rotary teeth (9), the raised rotary teeth (9) are arranged in at least 2 rows along the periphery of the rotor (2), each row comprises a plurality of raised rotary teeth (9) vertically arranged along the periphery of the rotor (2), and a hollow groove (23) is arranged between every two adjacent rows of raised rotary teeth (9) and serves as a space required by material movement; a plurality of protruding rotating teeth (9) on the periphery of the rotor (2) are meshed with a plurality of protruding fixed teeth (7) arranged on the inner wall of the barrel body (1), grooves (22) which are mutually embedded into each other are formed between every two protruding fixed teeth (7) or every two protruding rotating teeth (9), and spaces required by the size of target particles of materials are reserved between the protruding rotating teeth (9) and the protruding fixed teeth (7) which are meshed with each other; the granular crushed coal and the sludge are sheared into small granules with the diameter of 1mm to 5mm by mutually meshed raised rotary teeth (9) and raised fixed teeth (7) in a crushing part of the coal slurry crusher, and the small granules are discharged to a sludge water coal slurry collecting container from a discharge port of the coal slurry crusher after being thrown out by meshes (6) in a screen (5) area.
3. The method of sludge coal water slurry preparation of claim 1, wherein the granular crushed coal and sludge are sheared into small granules with a diameter of 1mm to 2 mm.
4. the method for preparing sludge coal water slurry as claimed in claim 1, wherein when the sludge is in a fluid state with a water content of 85% to 95%, the weight ratio of the granular crushed coal to the sludge is 1: 0.46 to 0.70; when the sludge is plastic sludge with the water content of 75-85%, the weight ratio of the granular crushed coal to the sludge is 1: 0.550-0.875.
5. The method for preparing sludge water coal slurry as claimed in claim 2, wherein the coal slurry crusher comprises a feed inlet (31), a feeding part, a crushing part and a discharge outlet (36) which are connected in sequence, the feeding part comprises a screw conveyor (29) driven by a first motor (27) and a first outer sleeve (30) sleeved outside the screw conveyor, and the first outer sleeve (30) is provided with the feed inlet (31) with an upward opening; the crushing component comprises a barrel (1) and a rotor (2) which is positioned in the barrel (1) and driven by a second motor (28), a chassis (15) is arranged at the end of the barrel (1) at the bottom surface of the rotor (2), and a shaft sealing device (16) is arranged on the outer side of the chassis (15); the screw conveyor (29) comprises a sleeve (33) and a spiral rib (34) spirally surrounding the sleeve (33), and the sleeve (33) is fixedly sleeved outside the shaft of the first motor (27).
6. The method for preparing sludge coal water slurry as claimed in claim 2, wherein the meshing intervals between all the mutually meshed convex rotating teeth (9) and convex fixed teeth (7) are consistent and are the intervals required by the target particle size of the material.
7. A stokehole slurrying system adopting the sludge coal water slurry preparation method according to any one of claims 1 to 6, which can be used for efficiently consuming and treating the residual sludge after sewage treatment with low cost, and is characterized in that the system sequentially comprises a coal slurry crusher, a water coal slurry tank, a conveying pump and a vertical fluidized bed boiler according to the treatment process, wherein the coal slurry crusher comprises a feeding port (31), a crushing part and a discharging port (36), the discharging port (36) of the coal slurry crusher is connected with a coal water slurry collecting container, the coal water slurry container is connected with the water coal slurry tank through the conveying pipe, and the water coal slurry tank is connected with a feeding port of the vertical fluidized bed boiler through the conveying pump and the conveying pipe.
8. The system for pulping the sludge water coal slurry in front of the furnace as claimed in claim 7, wherein a crusher is arranged in front of the coal slurry crusher and is used for crushing coal blocks into particle crushed coal with particle diameter of below 50 mm.
9. The system of claim 7, wherein the coal slurry pulverizer has a coal slurry collection container to receive the discharge port of the coal slurry pulverizer, and the coal slurry tank is lower than the coal slurry container.
10. The system for preparing slurry of sludge-water-coal-slurry in front of the furnace according to claim 7, wherein a pre-mixing container is arranged above the feed inlet (31) of the coal slurry pulverizer, a stirrer is arranged above the pre-mixing container and used for synchronously and continuously adding the granular pulverized coal and the sludge at intervals, and an opening is arranged at the lower end of the pre-mixing container and communicated with the feed inlet (31) of the coal slurry pulverizer.
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| CN116943474A (en) * | 2023-08-22 | 2023-10-27 | 深圳市尚水智能股份有限公司 | Dispersing mechanism and pulping equipment |
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| CN111392992A (en) * | 2020-03-15 | 2020-07-10 | 宁波领智机械科技有限公司 | Pharmaceutical sludge treatment method and barreled sludge unloading method thereof |
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| CN116943474A (en) * | 2023-08-22 | 2023-10-27 | 深圳市尚水智能股份有限公司 | Dispersing mechanism and pulping equipment |
| CN116943474B (en) * | 2023-08-22 | 2024-03-19 | 深圳市尚水智能股份有限公司 | Dispersing mechanism and pulping equipment |
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