CN110218594B - System and method for preparing gasification type coal water slurry from high ash fusion point coal slurry - Google Patents
System and method for preparing gasification type coal water slurry from high ash fusion point coal slurry Download PDFInfo
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- CN110218594B CN110218594B CN201910505844.4A CN201910505844A CN110218594B CN 110218594 B CN110218594 B CN 110218594B CN 201910505844 A CN201910505844 A CN 201910505844A CN 110218594 B CN110218594 B CN 110218594B
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Abstract
The invention discloses a system and a method for preparing gasification type coal water slurry by high ash fusion point coal slurry, which comprises a coal slurry pretreatment system, a coal blending treatment system, a grinding and pulping system and a coal slurry post-treatment system, wherein the coal slurry pretreatment system feeds the high ash fusion point coal slurry, water and a special dispersant into a multi-shaft strong shear disperser to prepare low concentration coal water slurry; the blending coal treatment system utilizes a crusher to crush the low-ash and low-ash fusion point coal to be less than or equal to 6mm to prepare blending coal; grinding the materials by a mill to prepare high-concentration water-coal-slurry, feeding the high-concentration water-coal-slurry into a coal-slurry post-treatment system, filtering out ultra-particle-size particles and impurities by a slurry filter, feeding the ultra-particle-size particles and the impurities into a buffer tank, adding a special dispersing agent again, feeding the mixture into a coal-slurry stability treatment tank after reaction, adding a stabilizing agent, and finally curing the mixture into a gasified water-coal-slurry product with stable characteristics. The method can expand the application range of processing and utilizing the coal slime with high ash and high ash melting point, reduce the cost of gasification raw materials, and has good economic, environmental and social benefits.
Description
Technical Field
The invention relates to a technology for preparing gasified coal water slurry by coal slurry, in particular to a system and a method for preparing gasified coal water slurry by coal slurry with a high ash fusion point.
Background
Coal slime is a sticky substance and consists of pulverized gangue, fine coal and water. The coal slime has the advantages of high particle content, fine granularity, high ash content, high water content and low heat value, can be sold at low price in most cases, has low economic benefit, and causes a large amount of dust emission in the combustion and utilization process. The coal slurry is used as a raw material to prepare the coal slurry water-coal slurry so as to realize the efficient utilization of resources, is a novel pulping technology developed on the basis of the coal slurry technology, and has great economic benefit and environmental protection benefit. The coal water slurry with the productivity of more than 70 percent is mainly used as a coal chemical (gasification) raw material, and synthesis gas, chemical derivatives and the like are prepared by utilizing a high-temperature high-pressure environment. At present, most of coal water slurry gasification furnaces require that the melting point of the fed ash is lower than 1350 ℃ so as to realize a stable slag tapping process and ensure the normal operation of the gasification furnace.
In the prior art, some researches are carried out on a process and a method for preparing coal water slurry by using coal slime, for example:
CN208200860U discloses a process for preparing coal water slurry by mixing sludge and coal slurry, which prepares the sludge and optional coal slurry into fuel type coal water slurry by methods of raw material modification, strong shearing, superfine grinding grading and the like. The method provides a way for the efficient utilization of the sludge and the coal slime, but if the high-ash coal slime is used, the problem that the ash content of the product seriously exceeds the standard is necessarily existed, and the method is not suitable for preparing the gasification type coal water slurry.
CN207362163U discloses a coal slurry continuous pulping complete equipment and a corresponding process of a coal preparation plant, which is characterized in that coal slurry products of the coal preparation plant are redispersed to prepare coal slurry, but the problems of ash fusion point and ash content are not considered, and the coal slurry is only suitable for self-heating in mining areas and the like for preparing fuel type coal slurry. If high ash coal slime is adopted, the coal slime has no value for external sale obviously.
CN106635208B discloses a process for directly preparing coal water slurry by using underflow of a thickener, which is characterized in that the coal slurry is not required to be filtered and dehydrated firstly, and can be sold after being separated by adding same-ore clean coal, but the method does not consider ash fusion problem, still aims at preparing fuel type coal water slurry, and does not consider gasification requirement.
From comprehensive analysis, the prior pulping technology has the following defects when used for coal slime pulping:
(1) the existing coal slurry pulping method mainly aims at preparing fuel type coal water slurry used by a coal preparation plant, and does not consider the gasification requirement of the coal water slurry; (2) the existing coal slurry pulping method only aims at low-ash coal slurry, and does not consider a high-ash fusion point coal slurry ash fusion point cooperative regulation and control method, so that the high-ash fusion point coal slurry with abundant reserves in China cannot be used as a coal slurry gasification raw material.
Therefore, the prior art can not meet the requirement of preparing gasification type coal water slurry by coal slurry, and the coal water slurry prepared by high-ash coal slurry is combusted to bring great dust pollution. Therefore, the system and the method for preparing the gasified water coal slurry by developing and adapting to the high-ash and high-ash-melting-point coal slurry can reduce the cost of the gasified raw materials, have important significance on comprehensive utilization of resources and have good environmental benefit and social benefit.
Disclosure of Invention
The invention aims to provide a system and a method for preparing gasification type coal water slurry from high ash fusion point coal slurry.
The purpose of the invention is realized by the following technical scheme:
the system for preparing the gasification type coal water slurry by the coal slurry with the high ash fusion point comprises a coal slurry pretreatment system, a blending coal treatment system, a grinding and pulping system and a coal slurry post-treatment system;
the coal slime pretreatment system comprises a multi-shaft strong shear dispersing machine, wherein the multi-shaft strong shear dispersing machine is provided with an incoming high-ash fusion point coal slime inlet, a water and dispersing agent mixing inlet and a low-concentration coal water slurry outlet;
the blended coal treatment system comprises a crusher, wherein the crusher is provided with an incoming low ash fusion point coal inlet and a blended coal outlet;
the grinding and pulping system comprises a grinder, wherein the grinder is provided with a low-concentration water-coal-slurry and blending coal mixing inlet, a dispersing agent inlet, a high-concentration water-coal-slurry outlet and a waste slurry inlet;
the coal slurry post-treatment system comprises a slurry filter, a buffer tank, a coal slurry stability treatment tank, a high-speed shearing intensifier, a homogenizing and curing tank and a slurry storage tank which are connected in sequence; or the coal slurry post-treatment system comprises a slurry filter, a buffer tank and a gasification furnace charging barrel which are connected in sequence;
the slurry filter is provided with a high-concentration water-coal-slurry inlet, a dispersing agent inlet, a waste slurry outlet and a slurry filtering outlet;
a high-concentration water-coal-slurry outlet of the mill is connected with a high-concentration water-coal-slurry inlet of a slurry filter, and a slurry filtering outlet of the slurry filter is connected with an inlet of the buffer tank;
the coal slurry stability treatment tank is provided with a stabilizer adding port and is connected with product conveying equipment;
a waste pulp tank is arranged between a waste pulp inlet of the mill and a waste pulp outlet of the pulp filter;
the system for preparing the gasified water coal slurry from the high-ash-melting-point coal slurry realizes the method for preparing the gasified water coal slurry from the high-ash-melting-point coal slurry, and comprises the following steps:
pre-dispersing the coal slime with high ash and high ash fusion point by the coal slime pre-treatment system;
carrying out crushing pretreatment on low-ash and low-ash fusion point coal through the blending coal treatment system;
grinding and pulping the fed materials mixed with the coal slime with high ash and high ash fusion points and the coal slime with low ash and low ash fusion points by the grinding and pulping system;
and carrying out impurity filtering and homogeneous curing on the discharge of the grinding and pulping system through the coal slurry post-treatment system, and producing the final finished product coal water slurry.
According to the technical scheme provided by the invention, the system and the method for preparing the gasification type coal water slurry by using the high ash fusion point coal slurry provided by the embodiment of the invention are combined with coal blending and a special additive to reduce the fusion point of the coal ash, and are used for preparing the gasification type coal water slurry in a composite manner, so that the concentration of the product coal water slurry is improved and the fluidity of the product coal water slurry is ensured. The gasification type coal water slurry prepared from the coal slurry with high ash content and high ash fusion point can be realized.
Drawings
Fig. 1 is a schematic flow chart of a system and a method for preparing gasification type coal water slurry from high ash fusion point coal slurry according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart of a system and a method for preparing gasification type coal water slurry from high ash fusion point coal slurry according to the second embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail below. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art.
The system for preparing gasification type coal water slurry by using the coal slurry with the high ash fusion point has the preferred specific implementation mode that:
the system comprises a coal slime pretreatment system, a blending coal treatment system, a grinding and pulping system and a coal slime post-treatment system;
the coal slime pretreatment system comprises a multi-shaft strong shear dispersing machine, wherein the multi-shaft strong shear dispersing machine is provided with an incoming high-ash fusion point coal slime inlet, a water and dispersing agent mixing inlet and a low-concentration coal water slurry outlet;
the blended coal treatment system comprises a crusher, wherein the crusher is provided with an incoming low ash fusion point coal inlet and a blended coal outlet;
the grinding and pulping system comprises a grinder, wherein the grinder is provided with a low-concentration water-coal-slurry and blending coal mixing inlet, a dispersing agent inlet, a high-concentration water-coal-slurry outlet and a waste slurry inlet;
the coal slurry post-treatment system comprises a slurry filter, a buffer tank, a coal slurry stability treatment tank, a high-speed shearing intensifier, a homogenizing and curing tank and a slurry storage tank which are connected in sequence; or the coal slurry post-treatment system comprises a slurry filter, a buffer tank and a gasification furnace charging barrel which are connected in sequence;
the slurry filter is provided with a high-concentration water-coal-slurry inlet, a dispersing agent inlet, a waste slurry outlet and a slurry filtering outlet;
a high-concentration water-coal-slurry outlet of the mill is connected with a high-concentration water-coal-slurry inlet of a slurry filter, and a slurry filtering outlet of the slurry filter is connected with an inlet of the buffer tank;
the coal slurry stability treatment tank is provided with a stabilizer adding port and is connected with product conveying equipment;
a waste pulp tank is arranged between a waste pulp inlet of the mill and a waste pulp outlet of the pulp filter;
the mill is a ball mill, a rod mill or a stirring mill.
The material conveying equipment among the equipment comprises a quantitative feeding coal water slurry pump, a rubber belt conveyor and a scraper.
The system for preparing the gasified water coal slurry from the high ash fusion point coal slurry realizes the method for preparing the gasified water coal slurry from the high ash fusion point coal slurry, and the preferred specific implementation mode is as follows:
pre-dispersing the coal slime with high ash and high ash fusion point by the coal slime pre-treatment system;
carrying out crushing pretreatment on low-ash and low-ash fusion point coal through the blending coal treatment system;
grinding and pulping the fed materials mixed with the coal slime with high ash and high ash fusion points and the coal slime with low ash and low ash fusion points by the grinding and pulping system;
and carrying out impurity filtering and homogeneous curing on the discharge of the grinding and pulping system through the coal slurry post-treatment system, and producing the final finished product coal water slurry.
The method comprises the following steps:
the coal slime pretreatment system utilizes a multi-shaft strong shear dispersing machine to shear, crush and separate incoming coal slime at a high speed, and simultaneously adds water and a special dispersing agent which are calculated by using amount, so that the coal slime is preliminarily prepared into low-concentration coal slime which is pumped into a grinding and pulping system;
the blending coal treatment system utilizes a crusher to crush the low ash and low ash fusion point coal to below 6mm, and the crushed blending coal is sent to a grinding and pulping system;
the grinding and pulping system grinds the obtained low-concentration water-coal-slurry, the crushed blended coal and the special dispersant through dosage calculation by using a grinder, so that the high-concentration water-coal-slurry is preliminarily prepared and is sent to a coal-slurry post-treatment system;
the coal slurry post-treatment system removes ultra-particle size particles and impurities from the obtained high-concentration coal slurry through a slurry filter, automatically flows into a buffer tank below an outlet of a mill to be continuously stirred, dispersed and temporarily stored, and can be supplemented or not supplemented with a special dispersing agent, and the coal slurry in the buffer tank is treated by any one of the following steps:
firstly, pumping the coal slurry into a coal slurry stability treatment tank, adding a stabilizer with calculated dosage, and stirring; the coal water slurry overflow flow in the coal slurry stability processing tank automatically flows into a high-speed shearing intensifier for high-strength shearing dispersion processing, the high-speed shearing intensifier is arranged above a homogenizing and curing tank, the coal water slurry processed by the high-speed shearing intensifier flows into the homogenizing and curing tank for stirring and curing, finally the product coal water slurry with good fluidity and good stability is obtained, the coal water slurry processed by the homogenizing and curing tank is pumped into a slurry storage tank for continuous stirring to avoid precipitation, and therefore the use or the transportation is facilitated;
secondly, the mixture enters a gasification furnace feeding barrel for standby.
The special dispersant is a single-component dispersant or a multi-component composite dispersant with fluxing action, and comprises naphthalene sulfonate, lignosulfonate or a composite dispersant specially added with a fluxing agent, wherein calcium ions replace sodium ions, and the total adding amount of the special dispersant added in sections is 0.1-2.0% of the mass of the dry coal of the water-coal-slurry product;
adding a naphthalenesulfonate system into the multi-shaft strong shear disperser, and making full use of the high wettability of the naphthalenesulfonate system to rapidly disperse the coal slime into low-concentration coal water slurry;
and a lignosulfonate system is added into the buffer tank for enhancing the steric hindrance effect and improving the stability.
The sources of the materials in the waste slurry tank comprise: ultra-particle size particles, waste slurry generated during starting production, domestic wastewater, factory floor washing water and waste slurry generated during equipment maintenance, wherein materials in a waste slurry tank are subjected to concentration detection and then are added into a grinding machine according to the calculated amount to be ground and pulped together with coal slime and added coal;
the water is clear water, waste water generated by gasification and utilization of coal water slurry or water in the middle of the process;
the high-ash and high-ash fusion point coal slime refers to coal slime which has ash content not less than 20 percent and softening temperature more than 1350 ℃ and does not meet the feeding requirement of a coal water slurry gasification furnace;
the low-ash and low-ash fusion coal refers to coal with ash content less than 20% and softening temperature less than or equal to 1350 ℃.
The feeding proportion of the high-ash and high-ash fusion point coal slime and the low-ash and low-ash fusion point coal is determined by taking the ash content of the materials mixed according to the proportion of less than 20% and the softening temperature of less than or equal to 1350 ℃ as standards, and the determined proportion is 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2 and 9:1 in terms of the mass proportion of a dry base;
the product coal water slurry is the coal water slurry with ash content and softening temperature meeting the requirements and the concentration meeting the requirements of a coal water slurry gasification furnace, and the mass percentage of solids in the product coal water slurry is 55-70%;
the shear rate of the product coal water slurry is 100s-1Under the conditions, the apparent viscosity value is lower than 1600 mPas, and the flow form is Newtonian fluid, Bingham fluid, pseudoplastic fluid or yield pseudoplastic fluid.
According to the system and the method for preparing the gasification type coal water slurry by the high ash fusion point coal slurry, on one hand, low ash and low ash fusion point coal is added for pulping, so that the fluidity and the concentration of the product coal water slurry meet the requirements of the gasification type coal water slurry, and simultaneously the ash content and the ash fusion point of the product coal water slurry are reduced; on one hand, the special additive is used for further reducing the ash fusion point while improving the fluidity of the high-concentration product coal water slurry, and optimizing the slag tapping effect of the gasifier; on the other hand, the difference of the particle size distribution of the coal slurry and the added coal is fully utilized, the high-efficiency grading is realized, and the fluidity of the product coal water slurry is ensured while the concentration of the product coal water slurry is improved. The gasification type coal water slurry prepared from the coal slurry with high ash content and high ash fusion point can be realized.
The stability of the invention refers to the period of time that the product coal water slurry does not generate precipitate which cannot be redispersed by stirring.
The water consumption of the invention refers to the water quantity obtained by calculation according to the coal slime moisture and consumption, the coal blending moisture and consumption, the moisture required by the coal water slurry product, the waste slurry concentration and consumption in the waste slurry tank, the sectional dosage and concentration of the special dispersant and other data. The water is one or more of clean water, waste water generated by gasifying and utilizing coal water slurry, waste slurry in a waste slurry tank and the like, but is not limited to the listed types.
The sources of the materials in the waste slurry tank are ultra-granular particles, waste slurry generated in startup production, domestic wastewater, factory floor washing water, waste slurry generated in equipment maintenance and the like. And after the concentration of the materials in the waste slurry tank is detected, the materials are mixed into the mill according to the calculated amount, and are ground and pulped together with the coal slime and the mixed coal.
Further, the water adding amount and the special dispersing agent adding amount of the coal slime pretreatment system are determined by calculation according to the concentration and the yield of the low-concentration coal water slurry. Generally, the concentration of the low-concentration coal water slurry is 30-60%.
Further, the special dispersant refers to a single-component dispersant or a multi-component composite dispersant with fluxing action, such as naphthalene sulfonate and lignosulfonate with calcium ions instead of sodium ions, or a composite dispersant specially added with fluxing agent, and the like. Generally, the total addition amount of the special dispersing agent added in sections is 0.1-2.0% of the quality of the dry coal of the water-coal-slurry product.
Furthermore, the special dispersing agent added in sections can be one section or can be divided into a plurality of sections, and when the special dispersing agent is added at different positions, the components of the dispersing agent can be changed or not except the addition amount is changed.
Further, changing the composition of the exclusive dispersant at the time of addition at a different position means to fully utilize the action of the dispersant of different composition. For example, the naphthalenesulfonate system is added to the multi-axial strong shear disperser to rapidly disperse the coal slurry into the low-concentration coal water slurry by sufficiently utilizing the high wettability, and the lignosulfonate system is added to the buffer tank to enhance steric hindrance and improve stability.
The various elements, equipment and process steps of the invention are not necessarily essential. For example, in a ready-to-use coal-water slurry gasification plant, the coal slurry stability treatment tank, the high-speed shear enhancer, the homogenizing slaking tank, and the slurry storage tank may be eliminated without adding a stabilizer, but the method and the apparatus are not limited to those described, and other modifications and reductions not described are also applicable.
The method of the invention adopts the high-ash and high-ash fusion point coal slurry to be used together with the low-ash and low-ash fusion point coal, adds water and additives, and finally prepares the high-quality water coal slurry meeting the requirement of the fusion point of the feed ash of the water coal slurry gasification furnace by means of crushing, grinding, multi-stage dosing, high-shear strengthening, homogenizing and curing and the like. The method fully utilizes the characteristics of fine granularity and coarse granularity of the added coal to optimize the granularity distribution of the product coal water slurry, and realizes the regulation and control of the ash melting point of the product by regulating the proportion of the coal slurry and the added coal and the special dispersant, thereby being beneficial to the comprehensive utilization of the coal slurry with high ash, high ash melting point and low value, optimizing the fluidity, the stability and the atomization of the feed material of the coal water slurry gasification furnace, and having good economic, environmental and social benefits.
The specific embodiment is as follows:
the invention will be described in detail below with reference to two embodiments.
Implementation case 1-coal slime production Unit direct supply gasification type coal water slurry
Under the condition, a coal water slurry gasification plant is not provided with a slurry preparation link but is provided with a slurry storage facility, and coal gasification conversion production is carried out by purchasing the coal water slurry as a raw material, wherein the concentration of the coal water slurry is more than or equal to 63 percent, the ash content is less than or equal to 18 percent, and the softening temperature is less than or equal to 1350 ℃. In this case, the coal water slurry is required to have good stability to prevent precipitation during transportation and storage. The setting embodiment is as follows.
As shown in attached figure 1, the water content of the filter-pressed coal slime of a coal preparation plant is 35 percent, the ash softening temperature is 1500 ℃, the ash content is 30 percent, and the upper limit of the granularity is 1 mm. The coal slurry is quantitatively fed into a multi-shaft strong shear dispersing machine through a belt conveyor, and is added with a proper amount of water and a first section of special dispersing agent (calcium naphthalenesulfonate system accounts for 50 percent of the total dry-base added chemicals), and is firstly prepared into low-concentration coal water slurry with the solid mass concentration of 45 percent through the strong shear effect, and the low-concentration coal water slurry is quantitatively fed into a ball mill through a pump.
Meanwhile, the outsourcing low-ash and low-ash fusion point coal has 8% of moisture, 9% of ash, 1180 ℃ of ash softening temperature and 50mm of particle size upper limit. The coal is crushed to be less than or equal to 6mm by a crusher to prepare blended coal, and the blended coal is quantitatively fed into a ball mill by a rubber belt conveyor.
The ratio of the amount of the low-concentration water coal slurry fed into the ball mill to the amount of the coal blending is 4:6 based on the dry coal, at the moment, the ash content of the mixed material is 16.8 percent, the softening temperature is less than or equal to 1320 ℃, and the requirement of a target coal water slurry gasification plant is met.
Adding a second section of special dispersing agent (calcium lignosulfonate system accounting for 40% of the total dry base adding amount) at the inlet of the ball mill, grinding the fed low-concentration water-coal slurry and the fed coal to prepare water-coal slurry with the concentration of 65%, automatically feeding the water-coal slurry into a slurry filter through a discharge port of the ball mill, filtering out particles and impurities with the particle size of more than 1mm, automatically feeding the water-coal slurry into a buffer tank for stirring, adding a third section of special dispersing agent (calcium lignosulfonate system accounting for 10% of the total dry base adding amount), and controlling the concentration to 64%. Pumping the coal water slurry to a coal slurry stability treatment tank by a pump, adding a stabilizer, stirring, enabling overflow of the coal water slurry to flow into a strong shearing intensifier, flowing into a homogeneous curing tank after a section of high-speed shearing, performing shearing curing for 2 hours to finally obtain the product coal water slurry, feeding the product coal water slurry into a slurry storage tank, and feeding the product coal water slurry into a slurry storage tank of a coal water slurry gasification plant by means of pipelines, tank trucks, railway transportation and the like.
Implementation case 2-coal slurry gasification plant purchases low-price high-ash and high-ash fusion point coal slurry for pulping
Under the condition, the coal water slurry gasification plant adopts the process of preparing and using the coal water slurry, does not need to arrange a large slurry storage facility, and reduces the cost of production raw materials by purchasing the coal slurry with low price, high ash and high ash fusion point. The coal water slurry gasification plant requires that the concentration of the coal water slurry is more than or equal to 62 percent, the ash content is less than or equal to 13 percent, the ash softening temperature is less than or equal to 1380 ℃, the water content of the original coal is 7 percent, the ash content is 8 percent, and the ash melting point is 1130 ℃. The embodiment in this case is as follows.
As shown in attached figure 2, the water content of the filter-pressed coal slime of the outsourcing coal preparation plant is 35 percent, the ash softening temperature is 1500 ℃, the ash content is 30 percent, and the upper limit of the granularity is 1 mm. The coal slurry is quantitatively fed into a multi-shaft strong shear dispersing machine through a belt conveyor, and is added with a proper amount of water and a first section of special dispersing agent (calcium naphthalenesulfonate system accounts for 50 percent of the total dry-base added chemicals), and is firstly prepared into low-concentration coal water slurry with the solid mass concentration of 45 percent through the strong shear effect, and the low-concentration coal water slurry is quantitatively fed into a ball mill through a pump.
The raw coal is crushed to be less than or equal to 6mm by a crusher to prepare blended coal, and the blended coal is quantitatively fed into a rod mill by a rubber belt conveyor.
The ratio of the amount of the low-concentration water coal slurry fed into the rod mill to the amount of the blended coal in terms of dry coal is 4:6, at the moment, the ash content of the mixed material is 16.8 percent, the softening temperature is less than or equal to 1310 ℃, and the requirement of a target water coal slurry gasification plant is met.
Adding a second section of special dispersing agent (calcium lignosulfonate system accounting for 40% of the total dry basis adding amount) at the inlet of the rod mill, grinding the fed low-concentration water-coal slurry and the fed coal to prepare water-coal slurry with the concentration of 65%, automatically flowing into a slurry filter through the discharge port of the rod mill, filtering out particles and impurities larger than 2mm, automatically flowing into a buffer tank for stirring, adding a third section of special dispersing agent (calcium lignosulfonate system accounting for 10% of the total dry basis adding amount), and controlling the concentration to 63%. The water-coal-slurry is pumped into a gasification furnace charging bucket through a pump and used as gasification furnace charging material.
By combining the above embodiments, the system and the method of the present invention can successfully prepare the coal water slurry meeting the gasifier feeding requirement by blending the ratio of the high ash and high ash fusion point coal slurry to the low ash and low ash fusion point coal.
The applicant claims that the present invention is illustrated by the detailed process equipment and process flow of the present invention through the above specific embodiments, but the present invention is not limited to the above detailed preparation process and method, i.e. it does not mean that the present invention must be implemented by relying on the above detailed process equipment and process flow. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (1)
1. A system for preparing gasified coal water slurry from high ash fusion point coal slurry realizes a method for preparing gasified coal water slurry from high ash fusion point coal slurry, which is characterized in that:
the system for preparing the gasification type coal water slurry by the coal slurry with the high ash fusion point comprises a coal slurry pretreatment system, a blending coal treatment system, a grinding and pulping system and a coal slurry post-treatment system;
the coal slime pretreatment system comprises a multi-shaft strong shear dispersing machine, wherein the multi-shaft strong shear dispersing machine is provided with an incoming high-ash fusion point coal slime inlet, a water and dispersing agent mixing inlet and a low-concentration coal water slurry outlet;
the blended coal treatment system comprises a crusher, wherein the crusher is provided with an incoming low ash fusion point coal inlet and a blended coal outlet;
the grinding and pulping system comprises a grinder, wherein the grinder is provided with a low-concentration water-coal-slurry and blending coal mixing inlet, a dispersing agent inlet, a high-concentration water-coal-slurry outlet and a waste slurry inlet;
the coal slurry post-treatment system comprises a slurry filter, a buffer tank, a coal slurry stability treatment tank, a high-speed shearing intensifier, a homogenizing and curing tank and a slurry storage tank which are connected in sequence; or the coal slurry post-treatment system comprises a slurry filter, a buffer tank and a gasification furnace charging barrel which are connected in sequence;
the slurry filter is provided with a high-concentration water-coal-slurry inlet, a dispersing agent inlet, a waste slurry outlet and a slurry filtering outlet;
a high-concentration water-coal-slurry outlet of the mill is connected with a high-concentration water-coal-slurry inlet of a slurry filter, and a slurry filtering outlet of the slurry filter is connected with an inlet of the buffer tank;
the coal slurry stability treatment tank is provided with a stabilizer adding port and is connected with product conveying equipment;
a waste pulp tank is arranged between a waste pulp inlet of the mill and a waste pulp outlet of the pulp filter;
the mill is a ball mill, a rod mill or a stirring mill;
the material conveying equipment among all the equipment comprises a quantitative feeding coal water slurry pump, a rubber belt conveyor and a scraper;
the method for preparing the gasification type coal water slurry by the coal slurry with the high ash fusion point comprises the following steps:
pre-dispersing the coal slime with high ash and high ash fusion point by the coal slime pre-treatment system;
carrying out crushing pretreatment on low-ash and low-ash fusion point coal through the blending coal treatment system;
grinding and pulping the fed materials mixed with the coal slime with high ash and high ash fusion points and the coal slime with low ash and low ash fusion points by the grinding and pulping system;
performing impurity filtration and homogeneous curing on the discharge of the grinding and pulping system through the coal slurry post-treatment system, and producing a final finished coal water slurry;
the method comprises the following steps:
the coal slime pretreatment system utilizes a multi-shaft strong shear dispersing machine to shear, crush and separate incoming coal slime at a high speed, and simultaneously adds water and a special dispersing agent which are calculated by using amount, so that the coal slime is preliminarily prepared into low-concentration coal slime which is pumped into a grinding and pulping system;
the blending coal treatment system utilizes a crusher to crush the low ash and low ash fusion point coal to below 6mm, and the crushed blending coal is sent to a grinding and pulping system;
the grinding and pulping system grinds the obtained low-concentration water-coal-slurry, the crushed blended coal and the special dispersant through dosage calculation by using a grinder, so that the high-concentration water-coal-slurry is preliminarily prepared and is sent to a coal-slurry post-treatment system;
the coal slurry post-treatment system removes ultra-particle size particles and impurities from the obtained high-concentration coal slurry through a slurry filter, automatically flows into a buffer tank below an outlet of a mill to be continuously stirred, dispersed and temporarily stored, and is supplemented or not supplemented with a special dispersing agent, and the coal slurry in the buffer tank is treated by any one of the following steps:
firstly, pumping the coal slurry into a coal slurry stability treatment tank, adding a stabilizer with calculated dosage, and stirring; the coal water slurry overflow flow in the coal slurry stability processing tank automatically flows into a high-speed shearing intensifier for high-strength shearing dispersion processing, the high-speed shearing intensifier is arranged above a homogenizing and curing tank, the coal water slurry processed by the high-speed shearing intensifier flows into the homogenizing and curing tank for stirring and curing, finally the product coal water slurry with good fluidity and good stability is obtained, the coal water slurry processed by the homogenizing and curing tank is pumped into a slurry storage tank for continuous stirring to avoid precipitation, and therefore the use or the transportation is facilitated;
secondly, the mixture enters a gasification furnace feeding barrel for standby;
the special dispersant is a single-component dispersant or a multi-component composite dispersant with fluxing action, and comprises naphthalene sulfonate, lignosulfonate or a composite dispersant specially added with a fluxing agent, wherein calcium ions replace sodium ions, and the total adding amount of the special dispersant added in sections is 0.1-2.0% of the mass of the dry coal of the water-coal-slurry product;
adding a naphthalenesulfonate system into the multi-shaft strong shear disperser, and making full use of the high wettability of the naphthalenesulfonate system to rapidly disperse the coal slime into low-concentration coal water slurry;
a lignosulfonate system is added into the buffer tank for enhancing the steric hindrance effect and improving the stability;
the sources of the materials in the waste slurry tank comprise: ultra-particle size particles, waste slurry generated during starting production, domestic wastewater, factory floor washing water and waste slurry generated during equipment maintenance, wherein materials in a waste slurry tank are subjected to concentration detection and then are added into a grinding machine according to the calculated amount to be ground and pulped together with coal slime and added coal;
the water is clear water, waste water generated by gasification and utilization of coal water slurry or water in the middle of the process;
the high-ash and high-ash fusion point coal slime refers to coal slime which has ash content not less than 20 percent and softening temperature more than 1350 ℃ and does not meet the feeding requirement of a coal water slurry gasification furnace;
the low-ash and low-ash fusion coal refers to coal with ash content less than 20% and softening temperature less than or equal to 1350 ℃;
the feeding proportion of the high-ash and high-ash fusion point coal slime and the low-ash and low-ash fusion point coal is determined by taking the ash content of the materials mixed according to the proportion of less than 20% and the softening temperature of less than or equal to 1350 ℃ as standards, and the determined proportion is 1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2 and 9:1 in terms of the mass proportion of a dry base;
the product coal water slurry is the coal water slurry with ash content and softening temperature meeting the requirements and the concentration meeting the requirements of a coal water slurry gasification furnace, and the mass percentage of solids in the product coal water slurry is 55-70%;
the shear rate of the product coal water slurry is 100s-1Under the conditions, the apparent viscosity value is lower than 1600 mPas, and the flow form is Newtonian fluid, Bingham fluid, pseudoplastic fluid or yield pseudoplastic fluid.
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