Gasification slag recovery system based on intelligent drying

Abstract

The invention relates to the technical field of gasification slag drying, in particular to a gasification slag recovery system based on intelligent drying, which comprises a crushing module, a drying module, a flotation module, a data acquisition module and a control module. The crushing module crushes gasified slag to a preset particle size, the drying module heats and dries the crushed particles, and the flotation module realizes fine carbon separation through a microbubble mixing assembly and the like. The data acquisition module is used for acquiring the specific surface area of the dried gasified slag, the particle agglomeration diameter in the flotation liquid and the bubble uniformity. And the control module identifies an agglomeration reason according to data acquired by the data acquisition module. The method solves the problem that in the prior art, identification of gasification slag particulate matter agglomeration reasons is single, the drying temperature and the smashing rate of a system are adjusted through bubble uniformity, interference of particulate matter agglomeration in flotation liquid on fine carbon adsorption through microbubbles is reduced, the fine carbon separation efficiency and precision are improved, and the quality of fine carbon is improved. Therefore, the recycling rate of useful components in the gasified slag is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gasification slag drying, and particularly relates to a gasification slag recovery system based on intelligent drying. BACKGROUND

[0002] As a core process of clean coal conversion, gasification technology produces a large amount of gasification slag while producing synthesis gas. The main components of the gasification slag are unburned fine coal, silicate minerals and a small amount of heavy metal oxides. If the gasification slag is directly stored or landfilled, not only the carbon resources in the gasification slag will be wasted, but also the harmful substances in the gasification slag will leach into the soil and water with rainwater, causing environmental pollution. At the same time, the gasification slag that is not fully dried is easy to produce dust, causing secondary pollution to the surrounding atmosphere. Therefore, how to efficiently recover fine coal in the gasification slag and realize the resource utilization of the fine coal has become a key problem to be solved in the current coal chemical industry.

[0003] At present, the recovery of fine coal in the gasification slag mostly adopts a "drying-flotation" combined process. However, the traditional recovery system has many technical defects. Firstly, the drying process mostly relies on manual experience to set the temperature and time, and lacks dynamic adaptation to the characteristics of the gasification slag. If the drying temperature is too low or the drying time is insufficient, the moisture on the surface of the gasification slag particles is not completely removed, and the pore structure cannot be fully expanded, resulting in a small specific surface area of the fine coal, which makes it difficult to effectively adhere to the micro-bubbles in the flotation process. If the drying temperature is too high or the drying time is too long, the fine coal particles will be excessively sintered, the pore structure will be damaged, and the specific surface area will also be reduced, which will easily absorb more impurities and affect the selectivity of the flotation. Secondly, the generation and mixing effect of micro-bubbles in the flotation link are poor. The micro-bubble generator of the traditional flotation tank mostly has a fixed gas output, and the rotation speed of the auger and paddle cannot be adjusted, resulting in uneven distribution of bubble diameters. Either the bubbles are too large, causing the fine coal particles to agglomerate and sink due to gravity, and failing to float to the liquid surface, or the bubbles are too small, failing to provide enough buoyancy to carry the fine coal to float, resulting in a low recovery rate of the fine coal. SUMMARY

[0004] Therefore, the present application provides a gasification slag recovery system based on intelligent drying to overcome the problem that the reasons for the agglomeration of the gasification slag particles after the drying treatment are single in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides a gasification slag recovery system based on intelligent drying, comprising:

[0006] A crushing module is configured to crush the gasification slag to a preset particle size.

[0007] A drying module is arranged at the output end of the crushing module and configured to heat and dry the crushed gasification slag particles.

[0008] a flotation module disposed at an output end of the drying module, including a flotation tank and a micro-bubble mixing assembly disposed vertically at a center position of the flotation tank, a circulation deflector disposed inside the flotation tank, and a scraping assembly disposed at a top of the flotation tank to separate fine carbon from the flotation tank;

[0009] a data acquisition module including a first acquisition unit disposed at an output end of the drying module to acquire a specific surface area of the dried gasified slag particles, a second acquisition unit disposed at a top of the flotation module to acquire a particle agglomeration diameter of the particles in the flotation liquid, and a third acquisition unit disposed at the top of the flotation module to acquire a bubble uniformity of the flotation liquid;

[0010] a control module connected to the data acquisition module, the flotation module, the drying module, and the crushing module, to determine whether the operation of the flotation module meets a preset standard according to the particle agglomeration diameter;

[0011] to verify whether the operation of the flotation module meets the preset standard according to the specific surface area of the gasified slag particles when it is preliminarily determined that the operation meets the preset standard, and to determine the reason why the operation of the flotation module does not meet the preset standard according to the bubble uniformity when it is preliminarily determined that the operation does not meet the preset standard.

[0012] Further, the control module preliminarily determines that the operation of the flotation module meets the preset standard when the particle agglomeration diameter is less than a preset agglomeration diameter threshold.

[0013] Further, the control module preliminarily determines that the operation of the flotation module does not meet the preset standard when the particle agglomeration diameter is greater than or equal to the preset agglomeration diameter threshold.

[0014] Further, the control module verifies whether the operation of the flotation module meets the preset standard according to the specific surface area of the gasified slag particles,

[0015] if the specific surface area is less than a preset specific surface area threshold, the control module verifies that the operation of the flotation module does not meet the preset standard, and reduces a drying heating duration of the drying module according to a difference between the preset specific surface area threshold and the specific surface area.

[0016] if the specific surface area is greater than or equal to the preset specific surface area threshold, the control module verifies that the operation of the flotation module meets the preset standard.

[0017] Further, the reduction amplitude of the drying heating duration of the drying module is positively correlated to the difference between the preset specific surface area threshold and the specific surface area.

[0018] Further, the control module determines the reason that the operation of the floatation module does not meet the preset standard according to the bubble uniformity,

[0019] If the bubble uniformity is less than the preset uniformity threshold, it is determined that the reason that the operation of the floatation module does not meet the preset standard is that the drying temperature of the drying module is substandard.

[0020] If the bubble uniformity is greater than or equal to the preset uniformity threshold, it is determined that the reason that the operation of the floatation module does not meet the preset standard is that the crushing rate of the crushing module is substandard.

[0021] Further, the control module increases the drying temperature of the drying module according to the difference between the preset uniformity threshold and the bubble uniformity in response to the drying temperature of the drying module being substandard, and decreases the crushing rate of the crushing module according to the difference between the bubble uniformity and the preset uniformity threshold in response to the crushing rate of the crushing module being substandard.

[0022] Further, the bubble uniformity is the ratio of the standard deviation of bubble diameter to the average diameter of the bubbles.

[0023] Further, the increase amplitude of the drying temperature of the drying module is positively correlated with the difference between the preset uniformity threshold and the bubble uniformity.

[0024] Further, the decrease amplitude of the crushing rate of the crushing module is positively correlated with the difference between the bubble uniformity and the preset uniformity threshold.

[0025] Compared with the prior art, the present application has the beneficial effects that through the cooperative work of the data acquisition module and the control module, the present application realizes the multi-dimensional accurate identification of the agglomeration reason.

[0026] Further, the data acquisition module not only acquires the specific surface area of the gasified slag particles after drying, but also acquires the agglomeration diameter of the particulate matters in the floatation liquid and the bubble uniformity, and the control module analyzes and judges the operation condition of the floatation module from different angles according to the above data, and then determines the specific reason leading to the agglomeration, such as low drying temperature or high crushing rate, etc., which provides a basis for subsequent targeted adjustment and solves the problem of single reason identification in the prior art.

[0027] Further, the present application introduces the specific surface area of the dried gasification slag particles as an important indicator for checking whether the operation of the flotation module meets the preset standard. The specific surface area reflects the surface properties of the gasification slag particles, which has an important influence on the flotation effect. By comparing the actual measured specific surface area with the preset specific surface area threshold, the control module can more accurately judge the running state of the flotation module. If the specific surface area is less than the preset threshold, it means that the drying effect may be poor, affecting the flotation separation, at this time the control module will reduce the drying heating time of the drying module to improve the drying effect and thus improve the flotation effect.

[0028] Further, the present application accurately judges and adjusts the drying temperature of the drying module and the crushing rate of the crushing module through the bubble uniformity. As a parameter reflecting the running state of the system, the bubble uniformity provides an intuitive and reliable basis for the control module, which helps to discover problems existing in the drying and crushing process in time and take corresponding measures for adjustment. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 A structure schematic diagram of a gasification slag recovery system based on intelligent drying according to an embodiment of the present application;

[0030] Figure 2 A whole structure schematic diagram of a flotation module equipment according to an embodiment of the present application;

[0031] Figure 3 A flow chart for preliminarily judging whether the operation of the flotation module meets the preset standard according to the particle agglomerate diameter according to an embodiment of the present application;

[0032] Figure 4 A flow chart for checking whether the operation of the flotation module meets the preset standard according to the specific surface area of the dried gasification slag particles according to an embodiment of the present application;

[0033] Figure 5 A flow chart for determining the reason why the operation of the flotation module does not meet the preset standard according to the bubble uniformity according to an embodiment of the present application;

[0034] In the figure: 1, flotation tank; 3, circulating shunt plate; 4, scraping assembly; 21, micro-bubble generator; 22, auger; 23, paddle; 24, inlet. DETAILED DESCRIPTION

[0035] In order to make the objects and advantages of the present application clearer, the present application will be further described below in combination with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0036] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art will appreciate that the embodiments are only used to explain the technical principles of the present application, and are not intended to limit the scope of protection of the present application.

[0037] Please refer to Figures 1-5 As shown in the drawings, they are respectively a structure schematic diagram of a gasification slag recycling system based on intelligent drying according to an embodiment of the present application; a whole structure schematic diagram of a flotation module equipment according to an embodiment of the present application; a flow chart for preliminarily determining whether the operation of the flotation module meets the preset standard according to the agglomerated diameter of the particulate matter according to an embodiment of the present application; a flow chart for checking whether the operation of the flotation module meets the preset standard according to the specific surface area of the dried gasification slag particles according to an embodiment of the present application; and a flow chart for determining the reason why the operation of the flotation module does not meet the preset standard according to the uniformity of the bubbles according to an embodiment of the present application.

[0038] The embodiment of the present application provides a gasification slag recycling system based on intelligent drying, which comprises:

[0039] A crushing module is used to crush the gasification slag to a preset particle size.

[0040] A drying module is arranged at the output end of the crushing module, and is used to heat and dry the crushed gasification slag particles.

[0041] A flotation module is arranged at the output end of the drying module, and comprises a flotation tank 1, a micro-bubble mixing assembly arranged vertically at the center position of the flotation tank 1, a circulating shunt plate 3 arranged inside the flotation tank 1, and a scraping assembly 4 arranged at the top of the flotation tank 1 and used to separate the flotation target refined carbon. The micro-bubble mixing assembly comprises a micro-bubble generator 21, an auger 22, a paddle 23, and a feeding port 24. The micro-bubble generator 21 is arranged at the input end of the auger 22, the output end of the auger 22 is provided with the paddle 23, and the feeding port 24 is arranged at the top of one side of the micro-bubble generator 21.

[0042] A data acquisition module comprises a first acquisition unit arranged at the output end of the drying module and used to acquire the specific surface area of the dried gasification slag particles, a second acquisition unit arranged at the top of the flotation module and used to acquire the agglomerated diameter of the particulate matter in the flotation liquid, and a third acquisition unit arranged at the top of the flotation module and used to acquire the uniformity of the bubbles in the flotation liquid.

[0043] A control module is connected with the data acquisition module, the flotation module, the drying module, and the crushing module, respectively, and is used to determine whether the operation of the flotation module meets the preset standard according to the agglomerated diameter of the particulate matter.

[0044] The gasification slag particles are preliminarily determined to meet the preset standard according to the specific surface area of the gasification slag particles to verify whether the operation of the flotation module meets the preset standard, and when the preliminary determination does not meet the preset standard, the reason why the operation of the flotation module does not meet the preset standard is determined according to the bubble uniformity.

[0045] Specifically, the preset particle size of the gasification slag particles is 0.15 mm; the first acquisition unit is an image acquisition device, specifically, an industrial camera Basler acA2500-14um; the second acquisition unit is a laser particle size analyzer, specifically, a Malvern Mastersizer 3000; and the third acquisition unit is an image acquisition device, specifically, an industrial camera Basler acA1920-50gc. The type of the first acquisition unit, the second acquisition unit and the third acquisition unit is not limited, as long as it can output corresponding image results according to the detected surface image of the gasification slag particles. It should be pointed out that the data in this embodiment are results obtained through preliminary experiments before the operation of the method, and the preset values can be adjusted according to the specific use, as long as the method can determine different specific conditions in the single determination process according to the obtained values.

[0046] Specifically, the circulating flow distribution plate 3 is fixed to the inner wall of the flotation tank 1, the bottom extends to 15 cm away from the bottom of the flotation tank 1, and the top is flush with the flotation liquid surface below the scraping assembly 4, so as to guide the particles not combined with micro-bubbles at the bottom of the flotation tank 1 to the input end of the micro-bubble mixing assembly, realize circulating flotation, and improve the recovery rate of fine carbon.

[0047] Specifically, the control module preliminarily determines that the operation of the flotation module meets the preset standard when the particle agglomeration diameter is less than the preset agglomeration diameter threshold. The preset agglomeration diameter threshold is set to 1.20 mm.

[0048] Specifically, the control module preliminarily determines that the operation of the flotation module does not meet the preset standard when the particle agglomeration diameter is greater than or equal to the preset agglomeration diameter threshold.

[0049] Specifically, the control module preliminarily determines that the operation of the flotation module meets the preset standard when the particle agglomeration diameter is less than the preset agglomeration diameter threshold; the particle agglomeration diameter is obtained by real-time acquisition and calculation of a particle image analyzer installed at the outlet of the flotation module, and the calculation method is to obtain the average value of the particle agglomeration diameter by counting the equivalent diameter of single particles after extracting the particle contour based on an image segmentation algorithm, so as to ensure that the data can truly reflect the agglomeration state of the particles after flotation.

[0050] Specifically, the control module checks whether the operation of the flotation module meets the preset standard according to the specific surface area of the gasification slag particles, wherein the preset specific surface area threshold is 1.4 m 2 / g,

[0051] If the specific surface area is less than the preset specific surface area threshold, it is checked that the operation of the flotation module does not meet the preset standard, and the drying heating time of the drying module is reduced according to the difference between the preset specific surface area threshold and the specific surface area.

[0052] If the specific surface area is greater than or equal to the preset specific surface area threshold, it is checked that the operation of the flotation module meets the preset standard.

[0053] Specifically, the drying heating time of the drying module causes the collapse of the pore structure of the gasification slag particles, and then the specific surface area of the gasification slag particles decreases.

[0054] Specifically, the drying heating time of the drying module causes the collapse of the pore structure of the gasification slag particles, and then the specific surface area of the gasification slag particles decreases. This collapse phenomenon usually starts to intensify significantly when the drying temperature exceeds 140℃ and the duration exceeds 90 minutes, so the heating temperature and the heating time of the drying module need to be controlled coordinately to avoid irreversible damage to the particle structure caused by a single parameter being too high.

[0055] Specifically, the reduction amplitude of the drying heating time of the drying module is positively correlated with the difference between the preset specific surface area threshold and the specific surface area. It can be understood that the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the specific linear positive correlation slope is not limited, which can be set according to the actual preparation condition, as long as the greater the difference between the preset specific surface area threshold and the specific surface area, the greater the reduction amplitude of the drying heating time of the drying module. For example, the reduction amplitude of the drying heating time of the drying module is set as △M, the difference between the preset specific surface area threshold and the specific surface area is set as △μ, then △M = γ × (△μ + μ0), γ is a heating time adjustment coefficient, and γ is set as 1.06, and μ0 is a constant.

[0056] Specifically, the control module determines the reason why the operation of the flotation module does not meet the preset standard according to the bubble uniformity, wherein the preset uniformity threshold is set as 1.7,

[0057] If the bubble uniformity is less than the preset uniformity threshold, it is determined that the reason why the operation of the flotation module does not meet the preset standard is that the drying temperature of the drying module is low.

[0058] If the bubble uniformity is greater than or equal to the preset uniformity threshold, it is determined that the operation of the floatation module does not meet the preset standard because the crushing rate of the crushing module is fast.

[0059] Specifically, the low drying temperature of the drying module causes the high humidity of the particulate matter entering the floatation module, and thus the significant agglomeration of the particulate matter; and the fast crushing rate of the crushing module causes the increased friction between the particulate matters in the floatation module, and thus the significant agglomeration of the particulate matter.

[0060] Specifically, when the operation of the floatation module does not meet the preset standard because the drying temperature of the drying module is low, the control module increases the drying temperature of the drying module according to the difference between the preset uniformity threshold and the bubble uniformity.

[0061] When the operation of the floatation module does not meet the preset standard because the crushing rate of the crushing module is fast, the control module decreases the crushing rate of the crushing module according to the difference between the bubble uniformity and the preset uniformity threshold.

[0062] Specifically, the bubble uniformity is the ratio of the standard deviation of the bubble diameter to the average diameter of the bubble. The smaller the bubble uniformity, the lower the dispersion degree of the bubble diameter, and the more uniform the size distribution of the bubble; on the contrary, the greater the bubble uniformity, the greater the difference in the bubble diameter, and the worse the uniformity. This index can quantitatively reflect the dispersion state of the bubble group in the floatation module, and is a key basis for judging whether the agglomeration of the particulate matter is significant - when the bubble uniformity is lower than the preset threshold, it means that the bubble cannot effectively disperse the particulate matter, which is easy to cause the agglomeration of the particulate matter due to collision.

[0063] Specifically, the bubble uniformity is the ratio of the standard deviation of the bubble diameter to the average diameter of the bubble, wherein the standard deviation of the bubble diameter and the average diameter of the bubble are obtained by real-time shooting of bubble images through an industrial camera installed on the inner wall of the floatation module, extraction of the contour of each bubble through an edge detection algorithm, calculation of the diameter of a single bubble, and statistics of the diameter data of all collected bubbles, so as to ensure that the bubble uniformity index can truly reflect the dispersion state of the bubble in the floatation process.

[0064] Specifically, the increase amplitude of the drying temperature of the drying module is positively correlated with the difference between the preset uniformity threshold and the bubble uniformity; and the decrease amplitude of the crushing rate of the crushing module is positively correlated with the difference between the bubble uniformity and the preset uniformity threshold. It can be understood that the positive correlation herein can refer to the above-mentioned positive correlation example, which is not described herein again.

[0065] Thus far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is readily understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the relevant technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

[0066] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application; the present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A smart drying based gasification slag recovery system, characterized by, The application relates to a gasification slag processing system, which comprises the following modules: a crushing module for crushing gasification slag into a preset particle size; a drying module arranged at the output end of the crushing module for heating and drying the crushed gasification slag particles; a flotation module arranged at the output end of the drying module, which comprises a flotation tank, a micro-bubble mixing assembly vertically arranged at the center of the flotation tank, a circulating shunt plate arranged inside the flotation tank, and a scraping assembly arranged at the top of the flotation tank for separating the flotation target fine carbon; the micro-bubble mixing assembly comprises a micro-bubble generator, an auger and a paddle, the micro-bubble generator is arranged at the input end of the auger, and the output end of the auger is provided with the paddle; a data acquisition module, which comprises a first acquisition unit arranged at the output end of the drying module for acquiring the specific surface area of the dried gasification slag particles, a second acquisition unit arranged at the top of the flotation module for acquiring the particle agglomeration diameter in the flotation liquid, and a third acquisition unit for acquiring the bubble uniformity in the flotation liquid; a control module connected with the data acquisition module, the flotation module, the drying module and the crushing module, which is used for determining whether the operation of the flotation module meets the preset standard according to the particle agglomeration diameter; after the initial determination that the operation of the flotation module meets the preset standard, the operation of the flotation module is verified according to the specific surface area of the gasification slag particles, and when the initial determination is that the operation of the flotation module does not meet the preset standard, the reason why the operation of the flotation module does not meet the preset standard is determined according to the bubble uniformity.

2. The smart drying based gasification slag recovery system of claim 1, wherein, When the particle agglomeration diameter is less than a preset agglomeration diameter threshold value, the control module initially determines that the operation of the flotation module meets the preset standard.

3. The smart drying based gasification slag recovery system of claim 2, wherein, When the particle agglomeration diameter is greater than or equal to the preset agglomeration diameter threshold value, the control module initially determines that the operation of the flotation module does not meet the preset standard.

4. The smart drying based gasification slag recovery system of claim 3, wherein, The control module verifies whether the operation of the flotation module meets the preset standard according to the specific surface area of the gasification slag particles. If the specific surface area is less than a preset specific surface area threshold value, it is verified that the operation of the flotation module does not meet the preset standard, and the drying and heating time of the drying module is reduced according to the difference between the preset specific surface area threshold value and the specific surface area. If the specific surface area is greater than or equal to the preset specific surface area threshold value, it is verified that the operation of the flotation module meets the preset standard.

5. The smart drying based gasification slag recovery system of claim 4, wherein, The reduction range of the drying and heating time of the drying module is positively correlated with the difference between the preset specific surface area threshold value and the specific surface area.

6. The smart drying based gasification slag recovery system of claim 5, wherein, The control module determines the reason why the operation of the flotation module does not meet the preset standard according to the bubble uniformity. If the bubble uniformity is less than a preset uniformity threshold value, it is determined that the reason why the operation of the flotation module does not meet the preset standard is that the drying temperature of the drying module is not up to standard. If the bubble uniformity is greater than or equal to the preset uniformity threshold value, it is determined that the reason why the operation of the flotation module does not meet the preset standard is that the crushing rate of the crushing module is not up to standard.

7. The smart drying based gasification slag recovery system of claim 6, wherein, The control module increases the drying temperature of the drying module according to a difference between the preset uniformity threshold and the bubble uniformity in response to the drying temperature of the drying module being substandard, and decreases the crushing rate of the crushing module according to a difference between the bubble uniformity and the preset uniformity threshold in response to the crushing rate of the crushing module being substandard.

8. The smart drying based gasification slag recovery system of claim 7, wherein, The bubble uniformity is a ratio of a standard deviation of bubble diameters to an average bubble diameter.

9. The smart drying based gasification slag recovery system of claim 8, wherein, The increase amplitude of the drying temperature of the drying module is positively correlated with the difference between the preset uniformity threshold and the bubble uniformity.

10. The smart drying based gasification slag recovery system of claim 9, wherein, The decrease amplitude of the crushing rate of the crushing module is positively correlated with the difference between the bubble uniformity and the preset uniformity threshold.

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