A coal conveying and dedusting system suitable for coal of spontaneous combustion

Abstract

The application discloses a coal conveying and dust removing system suitable for coal species easy to self-ignite, and particularly relates to the dust removing field, and comprises a multi-dimension parameter acquisition and processing module, a dust raising risk grade division module, a dust removing mode dynamic selection module, a dust removing core parameter quantitative regulation and control module and a real-time feedback iteration module. The multi-dimension parameter acquisition and processing module acquires multi-dimension data and marks the state close to the critical temperature of self-ignition and high concentration dust raising. The dust raising risk grade division module calculates a dust raising comprehensive risk index through the coupled acquired parameters, and divides the risk grade according to the dust raising comprehensive risk index value. The application divides the dust raising risk grade through multi-dimension parameter acquisition, dynamically selects the dust removing mode in combination with the particle characteristics of different transfer links, and quantitatively regulates and controls the core parameters, so that the problem that the dust raising characteristics of different transfer links are not distinguished, unified parameters are adopted, and the local dust removing efficiency is insufficient or energy is wasted is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust removal, more particularly, the present application relates to a coal conveying dust removal system suitable for easily self-igniting coal. BACKGROUND

[0002] In the field of thermal power generation, coal chemical industry, etc., easily self-igniting coal (such as high volatile bituminous coal, lignite, etc.) is an important energy raw material. When it is transported in the coal conveying system through the process of belt conveyor transfer and material dropping, a large amount of dust is easily generated due to the escape of volatile matter and particle collision. These dusts not only contain coal dust particles, but also contain unburned volatile gas. If not treated in time, it will lead to deterioration of the working environment, waste of energy, and even cause safety accidents such as explosion and self-ignition.

[0003] In the existing coal conveying dust removal technology, the wet dust collector captures dust by spraying water mist, has certain dust reduction effect, and can reduce the environmental temperature; the bag-type dust collector filters dust by using filter bag, and has high dust removal efficiency. However, for easily self-igniting coal, the existing technology has obvious deficiencies: first, the water mist amount of the wet dust removal is not properly controlled, which will cause the coal to have too high water content and accelerate the oxidation and self-ignition; the filter bag material of the bag-type dust collector is easy to adsorb volatile matter, and long-term use may cause the filter bag to burn due to local high temperature. Second, the dust removal process is not related to the self-ignition risk of the coal, and the equipment is only started and stopped according to the dust concentration, which will increase the explosion risk if not intervened in time when the volatile concentration in the dust exceeds the standard. Third, the dust intensity is different at different positions (such as the head and tail of the belt conveyor and the material dropping point) of the transfer station, and the existing technology uses unified dust removal parameters, which leads to incomplete local dust removal or waste of resources.

[0004] In view of the above problems, the present application provides a coal conveying dust removal system suitable for easily self-igniting coal, which dynamically adjusts the dust removal mode and parameters by real-time monitoring of the coal characteristics and environmental parameters, realizes the cooperation of dust removal efficiency and self-ignition risk prevention and control, and adapts to the dust difference at different transfer positions, thereby solving the problems of poor adaptability, high safety risk and unreasonable energy consumption of the existing technology. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, the present application provides a coal conveying dust removal system suitable for easily self-igniting coal, which solves the problems raised in the background art by the following scheme.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a coal conveying dust removal system suitable for easily self-igniting coal, comprising:

[0007] A multi-dimensional parameter acquisition and processing module: acquires multi-dimensional data and marks the state close to the self-ignition critical temperature and high concentration dust;

[0008] The dust risk grade division module: a comprehensive dust risk index is calculated by coupling the collected parameters, and a risk grade is divided according to the comprehensive dust risk index value;

[0009] The dust removal mode dynamic selection module: a dust removal mode is dynamically selected according to the risk grade and the proportion of coarse and fine particles;

[0010] The dust removal core parameter quantitative control module: including wet sub-module parameter calculation and bag type sub-module parameter calculation;

[0011] The real-time feedback iteration module: a correction coefficient is calculated in real time after dust removal, and the dust removal parameters are iteratively adjusted according to the correction coefficient value to ensure that the parameters match the dust state.

[0012] Preferably, the multi-dimensional data includes spontaneous combustion coal basic parameters and dust parameters; the spontaneous combustion coal basic parameters specifically include volatile matter mass fraction , spontaneous ignition point temperature , and initial moisture content ; the dust parameters specifically include dust concentration C, wherein the proportion of fine particles ≤ 3 μm , the proportion of coarse particles > 3 μm , and + = 100%, ambient temperature T, and ambient wind speed ; the marking includes: when T> 0.8 , it is determined that the ambient temperature is close to the spontaneous ignition critical value, and is marked as including a high temperature warning state; when C> , it is marked as a high concentration dust state.

[0013] Preferably, the comprehensive dust risk index ; the risk grade includes: low risk: <50; medium risk: 50<= <100; high risk: >=100.

[0014] Preferably, the dust removal mode: when the low risk and >=60% is selected, the wet sub-module is used to adsorb coarse particles with water mist, avoiding the blockage of bag filter material; when >60% is selected, the bag type sub-module is used to intercept fine particles through filter material, reducing the influence of water mist on the moisture content of coal; when the medium risk is adopted, the wet type + bag type combined mode is used, first through water mist dust removal 50%, and then deep purification through filter material; when the high risk is started, the bag type sub-module is started and the inert gas is sprayed in parallel, and the inert gas flow is positively correlated with the comprehensive dust risk index value, inhibiting the risk of volatile combustion.

[0015] Preferably, the wet sub-module parameter calculation is used to calculate the spray flow and water mist particle size; the spray flow When the wind speed is high, the water mist is easy to diffuse, and the spray amount needs to be reduced when the water content is high; when the volatile content is high, the flow is appropriately increased to enhance the cooling effect; the water mist particle size When coarse particles need larger water mist particle size to collide, and when the volatile content is high and the wind speed is high, smaller particle size is needed to enhance the diffusivity; the bag sub-module parameter calculation is used to calculate the filter bag filtering wind speed and the dust cleaning period; the filter bag filtering wind speed When the volatile content is high, the wind speed needs to be reduced to reduce the filter material adsorption, and the wind speed can be increased when the temperature difference is large; the dust cleaning period When the volatile content is high and the concentration of fine particles is high, the period needs to be shortened to reduce the filter material adsorption.

[0016] Preferably, the parameters after dust removal: after the dust removal is started, the risk early warning module collects in real time: the dust concentration after the dust removal , the filter bag surface temperature , and the water content of the coal type; the correction coefficient K specifically includes a bag correction coefficient and a wet correction coefficient; the bag correction coefficient ; the wet correction coefficient ; the adjustment of the dust removal parameters: when 0.8<=K<=1.2, the current parameters are maintained; when K<0.8 or K>1.2, the dust removal core parameter quantization control module is returned to recalculate the parameters until K is in a reasonable range.

[0017] The technical effects and advantages of the present application are:

[0018] 1. The present application divides the dust risk level by multi-dimensional parameter collection, dynamically selects the dust removal mode combined with the particle characteristics of different transportation links, and quantizes and controls the core parameters, solves the problem that different transportation links are not distinguished, a unified parameter is used, local dust removal efficiency is insufficient, or energy is wasted, and through the coupling calculation of the parameters and the spontaneous combustion characteristics of the coal type, the safety hazards of excessive wet spray amount leading to excessive water content of the coal type accelerating spontaneous combustion and the filter material adsorbing volatile parts causing combustion are solved, and the effect of coordinated control of dust removal efficiency and spontaneous combustion risk is achieved.

[0019] 2. The present application collects the parameters after dust removal in real time through the risk early warning module, calculates the correction coefficient K to realize dynamic iteration of the parameters, solves the problem that the fixed dust removal parameters are not adaptive when the coal conveying load fluctuates, leading to a decrease in dust removal efficiency or an increase in safety risk, achieves the effect of precise adaptation of the parameters to the real-time dust state, makes the system still maintain stable dust removal efficiency under the working condition of fluctuating coal conveying amount, reduces the invalid energy consumption of the equipment, and reduces the filter bag replacement frequency;

[0020] 3、The application solves the extreme safety hazard of easy spontaneous combustion of coal with high volatile matter accumulation, which is easy to cause explosion and spontaneous combustion, and achieves the effect of precise prevention and control of safety risks under high-risk working conditions, so that the concentration of flammable gas in the high-risk scene is always controlled within the lower limit of explosion, the safety accident rate is reduced, and the health of the operating personnel and the stability of the production system are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0023] As shown in the accompanying drawings, Figure 1 a coal conveying and dust removing system suitable for easy spontaneous combustion coal, comprising a multi-dimensional parameter acquisition and processing module, a dust risk grade division module, a dust removing mode dynamic selection module, a dust core parameter quantitative control module and a real-time feedback iteration module.

[0024] The multi-dimensional parameter acquisition and processing module: acquires multi-dimensional data and marks the state of approaching spontaneous combustion critical temperature and high concentration dust;

[0025] In this embodiment, it is specifically pointed out that: the multi-dimensional data includes spontaneous combustion coal basic parameters and dust parameters; the spontaneous combustion coal basic parameters specifically include volatile matter mass fraction , spontaneous combustion point temperature and initial moisture content ; the dust parameters specifically include dust concentration C, wherein, the proportion of fine particles ≤3μm , the proportion of coarse particles >3μm , and + =100%, ambient temperature T, and ambient wind speed ; the marking includes: when T>0.8 , it is determined that the ambient temperature approaches the spontaneous combustion critical value, and is marked as including a high temperature warning state; when C> , it is marked as a high concentration dust state.

[0026] The dust risk grade division module: calculates the dust comprehensive risk index by coupling the acquired parameters, and divides the risk grade according to the dust comprehensive risk index value;

[0027] In this embodiment, it is particularly necessary to point out that the dust raising comprehensive risk index ; the risk level includes: low risk: <50; medium risk: 50<= <100; high risk: >=100.

[0028] The dust removal mode dynamic selection module: dynamically selects the dust removal mode according to the risk level and the proportion of coarse and fine particles;

[0029] In this embodiment, it is particularly necessary to point out that the dust removal mode: when the low risk and >=60%, select the wet sub-module, use water mist to adsorb coarse particles to avoid bag filter blockage; when >60%, select the bag sub-module, intercept fine particles through filter material to reduce the influence of water mist on coal moisture content; when the medium risk, adopt the wet + bag combined mode, first reduce dust by 50% through water mist, and then purify through filter material; when the high risk, start the bag sub-module and parallelly drive inert gas injection, the inert gas flow is positively correlated with the dust raising comprehensive risk index value, and the volatile combustion risk is inhibited.

[0030] The dust removal core parameter quantitative control module: includes wet sub-module parameter calculation and bag sub-module parameter calculation;

[0031] In this embodiment, it is particularly necessary to point out that the wet sub-module parameter calculation is used to calculate the spraying flow and water mist particle size; the spraying flow , when the water mist is easy to diffuse at high wind speed, the spraying amount needs to be reduced at high moisture content, and the flow needs to be appropriately increased to enhance the cooling effect when the volatile content is high and the temperature is high; the water mist particle size , when coarse particles need larger water mist particle size to collide, smaller particle size is needed to enhance the diffusivity under high volatile content and high wind speed; the bag sub-module parameter calculation is used to calculate the filter bag filtration wind speed and the ash removal period; the filter bag filtration wind speed , when the volatile content is high, the wind speed needs to be reduced to reduce filter material adsorption, and the wind speed can be increased when the temperature difference is large; the ash removal period , when high volatile content and high concentration fine particles need to shorten the period to reduce filter material adsorption.

[0032] The real-time feedback iteration module: real-time collection of dust removal parameter correction coefficients after dust removal, iteration adjustment of dust removal parameters according to the correction coefficient value, and ensuring that the parameters match the dust raising state

[0033] In this embodiment, it is particularly necessary to point out that the dust removal parameter after dust removal: after the dust removal is started, the risk warning module real-time collects: the dust concentration after dust removal, the filter bag surface temperature and moisture content of the coal type; the correction factor K specifically includes a bag type correction factor and a wet type correction factor; the bag type correction factor ; the wet type correction factor ; the adjustment of the dedusting parameter: when 0.8<=K<=1.2, the current parameter is maintained; when K<0.8 or K>1.2, the parameter is recalculated by returning to the dedusting core parameter quantitative regulation module until K is in a reasonable range.

[0034] The present application divides the dust risk level through multi-dimensional parameter collection, dynamically selects the dedusting mode combined with the particle characteristics of different transportation links, and quantitatively regulates the core parameters, solves the problem that the characteristics of dust in different transportation links are not distinguished, the unified parameters are used, the local dedusting efficiency is insufficient or the energy is wasted, and through the coupling calculation of the parameters and the spontaneous combustion characteristics of the coal type, the safety hazards that the excessive wet spraying leads to the moisture content of the coal type exceeding the standard and the bag filter material adsorbs the volatile matter to cause combustion are solved, the effect of coordinated control of dedusting efficiency and spontaneous combustion risk is achieved, the real-time collection of the parameters after dedusting is realized through the risk early warning module, the correction factor K is calculated to realize the dynamic iteration of the parameters, the problem that the fixed dedusting parameters are insufficient in adaptability when the coal conveying load fluctuates, the dedusting efficiency is reduced or the safety risk rises again is solved, the effect of accurate adaptation of the parameters and the real-time dust state is achieved, the system can still maintain stable dedusting efficiency under the working condition of fluctuating coal conveying amount, meanwhile, the invalid energy consumption of the equipment is reduced, and the filter bag replacement frequency is reduced; through the linkage of inert gas injection in the high-risk scene, the extreme safety hazards that the high volatile dust accumulation of the easily spontaneous combustion coal type easily causes explosion and spontaneous combustion are solved, the effect of accurate prevention and control of safety risk under high-risk working condition is achieved, the combustible gas concentration in the high-risk scene is always controlled within the lower limit of explosion, the safety accident rate is reduced, and the health of the operating personnel and the stability of the production system are ensured.

[0035] The core rationality of the scheme is derived from the grasp of the physical law of the dust characteristics of the easily spontaneous combustion coal type and the dedusting mechanism, through the layer-by-layer association of parameter collection, calculation and regulation, a closed loop logic is formed: the pertinence of parameter collection: the mass fraction of volatile matter, the spontaneous combustion point temperature and the initial moisture content are selected as the core parameters of the coal type, because the three directly determine the spontaneous combustion risk of the easily spontaneous combustion coal type; at the same time, the parameters of dust concentration C, the proportion of coarse and fine particles, the environmental temperature and the wind speed are collected, because these factors directly affect the dust diffusion speed and the capture difficulty. The parameter selection is not redundant, and is strongly related to the dedusting efficiency and safety risk, laying a physical foundation for subsequent calculation. The physical meaning of the calculation formula: the parameter association of all formulas follows the inherent law of dedusting and safety. There is no subjective weight in the formula, and the multiplication and division relationship between parameters is completely based on the causal association of the physical process, ensuring the objectivity of the calculation result. The integrity of the closed loop: from parameter collection to risk division, to mode selection, parameter regulation, finally through real-time feedback iteration to correct the deviation, forming a closed loop of perception-decision-execution-verification.

[0036] Secondly: the drawings of the disclosed embodiments only involve the structures involved in the disclosed embodiments, other structures can refer to the general design, and in the case of no conflict, the same embodiments and different embodiments of the present application can be combined with each other;

[0037] Finally: the above only describes the preferred embodiments of the present application and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coal conveying dust removal system suitable for easily self-igniting coal, characterized in that, include: Multi-dimensional parameter acquisition and processing module: Acquires multi-dimensional data and marks conditions close to the spontaneous combustion critical temperature and high concentration of dust. The multidimensional data includes basic parameters of spontaneously combusting coal and dust parameters; the basic parameters of spontaneously combusting coal specifically include the volatile matter mass fraction. Autoignition temperature and initial moisture content The dust parameters specifically include dust concentration C, wherein the proportion of fine particles ≤3μm is [missing information]. The proportion of coarse particles > 3μm ,and + =100%, ambient temperature T, ambient wind speed The marker includes: when T>0.8 When the ambient temperature is determined to be close to the spontaneous combustion threshold, it is marked as a high-temperature warning state; when C> At that time, it was marked as a high-concentration dust condition; Dust risk level classification module: Calculates the comprehensive dust risk index by coupling the collected parameters, and classifies the risk level according to the comprehensive dust risk index value; The comprehensive dust risk index The risk levels include: Low risk: <50; Medium risk: High risk: 100; Dynamic dust removal method selection module: Dynamically selects the dust removal method based on the risk level and the ratio of coarse to fine particles; The dust removal method: when low risk and At 60%, select the wet filter module to use water mist to adsorb coarse particles and avoid clogging of the bag filter media; when When the dust concentration is >60%, the bag filter module is selected to intercept fine particles through the filter media, reducing the impact of water mist on the moisture content of the coal. When the risk is medium, a wet filter + bag filter combined mode is adopted, first reducing dust by 50% through water mist, and then further purifying through the filter media. When the risk is high, the bag filter module is activated and linked with the inert gas injection. The inert gas flow rate is positively correlated with the comprehensive dust risk index value, suppressing the risk of volatile matter combustion. Dust removal core parameter quantitative control module: including wet scrubbing submodule parameter calculation and bag filter submodule parameter calculation; The wet spray submodule parameter calculation is used to calculate the spray flow rate and water mist particle size; the spray flow rate When the wind speed is high, the water mist diffuses easily; when the moisture content is high, the spray volume needs to be reduced; when the volatile content and temperature are high, the flow rate should be appropriately increased to enhance the cooling effect; the water mist particle size... When coarse particles require larger water mist particle size for collision, and when high volatile matter and high wind speed require smaller particle size to enhance diffusion; the bag submodule parameter calculation is used to calculate the filter bag filtration velocity and dust removal cycle; the filter bag filtration velocity When the volatile content is high, the air velocity needs to be reduced to decrease filter media adsorption; when the temperature difference is large, the air velocity can be increased; the aforementioned dust removal cycle When high volatile matter and high concentration of fine particles are present, the cycle time needs to be shortened to reduce the adsorption of the filter media; Real-time feedback iteration module: Collects parameters after dust removal in real time, calculates correction coefficients, and iteratively adjusts dust removal parameters based on the correction coefficient values ​​to ensure that the parameters match the dust state.

2. The coal conveying dust removal system suitable for easily self-igniting coal as described in claim 1, characterized in that: The parameters after dust removal are as follows: After the dust removal is started, the risk warning module collects the dust concentration in real time. Filter bag surface temperature and the moisture content of the coal; the correction coefficient K specifically includes a bag-type correction coefficient and a wet correction coefficient; the bag-type correction coefficient The wet correction factor The dust removal parameters are adjusted as follows: when 0.8... K When K is 1.2, maintain the current parameters; when K < 0.8 or K > 1.2, return to the dust removal core parameter quantification and control module to recalculate the parameters until K is within a reasonable range.

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