Dynamic dust raising inhibitor for open-air coal yard and preparation method and preparation device of dynamic dust raising inhibitor

Abstract

The invention relates to an open-air coal yard dynamic dust raising inhibitor and a preparation method and a preparation device thereof, and the inhibitor comprises the following components in percentage by weight: 3-5% of pulverized coal, 5-10% of starch grafted acrylic polymer, 5-10% of lauryl sodium sulfate, 5-10% of acrylamide, 5-10% of modified starch and the balance of water. 1-2% of a starch grafted acrylic polymer; 0.03 to 0.05 percent of lauryl sodium sulfate, 0.1 to 0.5 percent of acrylamide and 1 to 2 percent of modified starch; sodium dodecyl sulfate is chemically pure, and the inhibitor has the following advantages that 1, the inhibitor has good wettability and permeability, and can rapidly permeate into coal, effectively fix dust on the surface of sandy soil, reduce wind erosion and form a hard consolidation layer, so that the purpose of controlling and improving the sand damage environment is achieved; 2, the inhibitor has flexible coagulation property, and the inhibitor can cover the surface of dust, so that fine dust particles are coagulated into larger particles; and 3, the dust remover has certain viscosity and can effectively adsorb dust particles and reduce flying of the dust particles. And 4, manufacturing and spraying of the inhibitor are automatically controlled by the inhibitor preparation device, and the efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of dust suppressants, and in particular to an open-air coal yard dynamic dust suppressant and a preparation method and a preparation device thereof. Background Art

[0002] The national environmental protection requirement is that the dust concentration in open-air coal yards should not exceed 4mg·m-3. However, due to the influence of wind on open-air coal yards, dynamic dust is relatively serious. At the same time, the coal transportation system produces a large amount of dust and the space is closed. The dust concentration in the coal transportation system is much higher than the national standard that the dust concentration in the working area should not exceed 4mg·m-3. Dust suppression measures must be taken. The existing dust suppression measures are mainly through spraying water and building closed coal tanks (sheds). The dust suppression effect is relatively poor. The reason is: since coal dust is caused by factors such as traction airflow, induced airflow, and shear airflow, and the coal flow speed is fast, it is required to be able to suppress dust quickly. This requires the reagent to have good coagulation and wettability, so that the dust particles are quickly wetted and coagulated together, increasing the particle size and weight of the dust particles to achieve the effect of dust suppression. At the same time, the reagent must have good permeability so that the reagent can quickly penetrate the coal. Water obviously does not have the above effect. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the present invention provides a dynamic dust suppressant for an open-air coal yard having good coagulation, wettability, permeability and obvious dust suppression effect, and a preparation method and a preparation device thereof.

[0004] The purpose of the present invention is to be achieved through the following technical solutions:

[0005] A dynamic dust suppressant for an open-air coal yard comprises coal powder, starch grafted acrylic polymer, sodium lauryl sulfate, acrylamide, modified starch and water, wherein the weight percentages are as follows: coal powder: 3-5%; starch grafted acrylic polymer: 1-2%; sodium lauryl sulfate: 0.03-0.05%, acrylamide 0.1-0.5%, modified starch 1-2%; water 90-95%.

[0006] The sodium lauryl sulfate is chemically pure.

[0007] A preparation device for dynamic dust suppressant in an open-air coal yard, comprising a starch grafted acrylic polymer dissolving box 120, a coal flow dust suppressant preparation box 130, a sodium dodecyl sulfate dissolving box 140, an agitator 150, a flow meter 160, a coal flow dust suppressant nozzle 170, a dust concentration measuring instrument 180, a control cabinet 190, a pump 220, and a stop valve 230. The starch grafted acrylic polymer dissolving box 120 and the sodium dodecyl sulfate dissolving box 140 are respectively connected to the coal flow dust suppressant preparation box 130, and the starch grafted acrylic polymer dissolving box 120, the coal flow dust suppressant preparation box 130, and the sodium dodecyl sulfate dissolving box 140 are respectively provided with agitators. 150, the coal flow dust suppressant preparation box 130 is connected to the coal flow dust suppressant nozzle 170, and a flow meter 160, a pump 220, and a stop valve 230 are arranged between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170, and a pump 220, a stop valve 230, and a flow meter 160 are respectively arranged at the inlets of the starch grafted acrylic polymer solution box 120, the coal flow dust suppressant preparation box 130 and the sodium dodecyl sulfate solution box 140, and a pump 220 and a stop valve 230 are respectively arranged between the starch grafted acrylic polymer solution box 120, the sodium dodecyl sulfate solution box 140 and the coal flow dust suppressant preparation box 130, and a control cabinet 190 controls the automatic operation of the device.

[0008] A method for preparing a dynamic dust suppressant for an open-air coal yard, characterized in that the method is prepared by the following steps:

[0009] 1. Add 1-2% starch grafted acrylic acid polymer and 0.03-0.5% sodium lauryl sulfate into the starch grafted acrylic acid polymer solution box 120;

[0010] 2. Add 0.1-0.5% acrylamide and 1-2% modified starch into the sodium dodecyl sulfate solution box 140;

[0011] 3. Start the control cabinet 190 to start automatic dispensing.

[0012] 4. The pump 220 and the stop valve 230 in front of the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140 are turned on to automatically add 10% deionized water into the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140, and the flow meter 160 measures the added salt water.

[0013] 5. The agitators 150 in the starch grafted acrylic acid polymer solution box 120 and the sodium dodecyl sulfate solution box 140 are started to mix and blend the reagents and water.

[0014] 6. Start the pump 220 and the stop valve 230 between the starch grafted acrylic polymer solution box 120, the sodium dodecyl sulfate solution box 140 and the coal flow dust suppressant preparation box 130, add the solutions in the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140 into the preparation box, and start the agitator 150 in the coal flow dust suppressant preparation box 130 to mix the two solutions evenly.

[0015] 7. Start the pump 220 and the stop valve 230 on the front side of the coal flow dust suppressant preparation box 130, and add 80-85% desalted water and 3-5% coal powder.

[0016] 8. Start the agitator 150 in the coal flow dust suppressant preparation box 130 to start stirring, control the speed to 2000r / min, and stir for 30 minutes until all reagents and solutions are evenly mixed, that is, the dynamic dust suppressant is synthesized.

[0017] A method for spreading dynamic dust suppressant in an open-air coal yard, characterized in that the spreading is carried out through the following steps:

[0018] 1. Place the coal flow dust suppressant nozzle 170 in the area where dust suppression is required.

[0019] 2. Start the dust concentration meter 180 to detect the dust concentration.

[0020] 3. Start the control cabinet 190 and enter the spreading mode;

[0021] 4. Start the pump 220 between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170, and the coal flow dust suppressant nozzle 170 sprays the suppressant onto the coal flow.

[0022] Beneficial effects: 1. The inhibitor of the present invention has good wettability and permeability. The inhibitor can quickly penetrate into the coal, effectively fix the dust on the surface of the sand, reduce wind erosion, form a hard consolidation layer, and achieve the purpose of controlling and improving the sand damage environment. 2. The present invention has flexible coagulation. The inhibitor can cover the surface of the dust and condense the fine dust particles into larger particles. 3. The present invention has a certain viscosity and can effectively absorb dust particles and reduce their flying. 4. The manufacture and spraying of the inhibitor are automatically controlled by the inhibitor preparation device, which is highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the device for preparing dynamic dust suppressant in an open-air coal yard according to the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below according to the accompanying drawings and embodiments:

[0025] The preparation device of dynamic dust suppressant in open-air coal yard comprises a starch grafted acrylic polymer dissolving box 120, a coal flow dust suppressant preparation box 130, a sodium dodecyl sulfate dissolving box 140, an agitator 150, a flow meter 160, a coal flow dust suppressant nozzle 170, a dust concentration measuring instrument 180, a control cabinet 190, a pump 220, and a stop valve 230. The starch grafted acrylic polymer dissolving box 120 and the sodium dodecyl sulfate dissolving box 140 are respectively connected to the coal flow dust suppressant preparation box 130, and the starch grafted acrylic polymer dissolving box 120, the coal flow dust suppressant preparation box 130, and the sodium dodecyl sulfate dissolving box 140 are respectively provided with an agitator 150, a flow meter 160, a coal flow dust suppressant nozzle 170, a dust concentration measuring instrument 180, a control cabinet 190, a pump 220, and a stop valve 230. 0, the coal flow dust suppressant preparation box 130 is connected to the coal flow dust suppressant nozzle 170, and a flow meter 160, a pump 220, and a stop valve 230 are arranged between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170. The inlets of the starch grafted acrylic polymer solution box 120, the coal flow dust suppressant preparation box 130 and the sodium dodecyl sulfate solution box 140 are respectively provided with a pump 220, a stop valve 230, and a flow meter 160. A pump 220 and a stop valve 230 are respectively arranged between the starch grafted acrylic polymer solution box 120, the sodium dodecyl sulfate solution box 140 and the coal flow dust suppressant preparation box 130. The control cabinet 190 controls the automatic operation of the device.

[0026] The control cabinet 190 of the device adopts PLC to automatically control the automatic operation of the entire device. During the operation, the flow meter 160 will measure the dosage of the starch grafted acrylic polymer solution box 120, the coal flow dust suppressant preparation box 130, and the sodium dodecyl sulfate solution box 140. The control cabinet 190 controls the start and stop of the water pump 220 according to the data collected by the flow meter 160. The start and stop and the stirring time of the agitator 150 are all controlled by the control cabinet 190. It is simple to use, highly efficient, and the quality of the inhibitor is good.

[0027] The method for preparing dynamic dust suppressant in open-air coal yard using the above device is as follows:

[0028] 1. Add 1-2% starch grafted acrylic acid polymer and 0.03-0.5% sodium lauryl sulfate into the starch grafted acrylic acid polymer solution box 120;

[0029] 2. Add 0.1-0.5% acrylamide and 1-2% modified starch into the sodium dodecyl sulfate solution box 140;

[0030] 3. Start the control cabinet 190 to start automatic dispensing.

[0031] 4. The pump 220 and the stop valve 230 in front of the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140 are turned on to automatically add 10% deionized water into the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140, and the flow meter 160 measures the added salt water.

[0032] 5. The agitators 150 in the starch grafted acrylic acid polymer solution box 120 and the sodium dodecyl sulfate solution box 140 are started to mix and blend the reagents and water.

[0033] 6. Start the pump 220 and the stop valve 230 between the starch grafted acrylic polymer solution box 120, the sodium dodecyl sulfate solution box 140 and the coal flow dust suppressant preparation box 130, add the solutions in the starch grafted acrylic polymer solution box 120 and the sodium dodecyl sulfate solution box 140 into the preparation box, and start the agitator 150 in the coal flow dust suppressant preparation box 130 to mix the two solutions evenly.

[0034] 7. Start the pump 220 and the stop valve 230 on the front side of the coal flow dust suppressant preparation box 130, and add 80-85% desalted water and 3-5% coal powder.

[0035] 8. Start the agitator 150 in the coal flow dust suppressant preparation box 130 to start stirring, control the speed to 2000r / min, and stir for 30 minutes until all reagents and solutions are evenly mixed, that is, the dynamic dust suppressant is synthesized.

[0036] The method of spreading dynamic dust suppressant in open-air coal yard is as follows:

[0037] 1. Place the coal flow dust suppressant nozzle 170 in the area where dust suppression is required.

[0038] 2. Start the dust concentration measuring instrument 180 to detect the dust concentration.

[0039] 3. Start the control cabinet 190 and enter the spreading mode;

[0040] 4. Start the pump 220 between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170, and the coal flow dust suppressant nozzle 170 sprays the suppressant onto the coal flow.

[0041] The control cabinet 190 automatically controls the spraying amount of the dust suppressant according to the data collected by the dust concentration measuring instrument 180.

[0042] Spraying the product of the present invention on the surface of coal ash accumulation at room temperature can form a solidified layer on the surface of the ash field; and performing wind erosion rate and solidified layer thickness inspection according to the above-mentioned use method.

[0043] Wind erosion rate test method: Take a certain amount of coal powder, bake it in an oven at 40°C for 100 minutes to remove moisture. Take an appropriate amount of samples and place them on 3 flat plates respectively, so that the sample surface is flush with the plate, and weigh them separately, where the mass of the sample is M1. Spray dust inhibitors on the two flat plates in proportion, bake them in an oven at 60°C for 100 minutes, and then put them into a wind tunnel respectively. Erosion is carried out for 10 minutes under the condition of a wind speed of 25m / s on the sample surface, and then weigh them separately. The mass of the remaining sample is M2. Calculate the sample wind erosion rate ζ according to the formula ζ=[(M1-M2) / M1]×100% and take the average value.

[0044] Test method for thickness of cured layer: Take the cured layer at 8 locations on the flat plate, measure its thickness with a vernier caliper, and take the average value.

[0045] The composition of the dust suppressant used in the above examples is shown in Table 1, and Table 2 shows the effect of the dust suppressant on coal ash.

[0046] Table 1

[0047]

[0048] Table 2

[0049]

[0050] The results show that the wind erosion rate of the coal ash of the composite inhibitor of the present invention does not exceed 0.04%, and the thickness of the solidified layer can reach more than 3 cm, which is a highly efficient inhibitor. The present invention makes full use of starch grafted acrylic polymer to slightly reduce the surface tension of the dust suppressant, improve the wettability of the dust suppressant, so that it can better cover the dust surface, effectively fix the dust on the sand surface, reduce wind erosion, and form a hard consolidation layer. Sodium dodecyl sulfate can reduce the surface tension of water, making it easier for water molecules to penetrate and disperse stains. Through its wettability and coagulation, it effectively reduces the flying and diffusion of dust. Acrylamide or its polymer has a certain viscosity, which can adsorb dust particles and reduce their flying. Through grafting copolymerization with starch and other substances, a polymer material with excellent dust suppression performance can be made for controlling dust pollution. The inhibitor is sprayed or poured on the surface of the ash field to directly form a solidified layer with a certain strength, covering the ash field, making it closed, and preventing dust from flying. Practice has proved that spraying the product of the present invention on the coal and mineral powder accumulation area can form a dense solidified film on the surface of the ash field. The film has uniform thickness, high viscosity and good stability, and can effectively reduce the pollution and dust loss to the surrounding environment caused by coal during storage and transportation.

Claims

1. A dynamic dust suppressant for an open-air coal yard, characterized in that : The inhibitor is composed of coal powder, starch grafted acrylic acid polymer, sodium lauryl sulfate, acrylamide, modified starch, and water, wherein the weight percentages are as follows: coal powder: 3-5%; starch grafted acrylic acid polymer: 1-2%; Sodium lauryl sulfate: 0.03-0.05%, acrylamide 0.1-0.5%, modified starch 1-2%; water 90-95%.

2. The open-air coal yard dynamic dust suppressant according to claim 1 is characterized in that : The sodium lauryl sulfate is chemically pure.

3. A preparation device for dynamic dust suppressant in open-air coal yard, characterized in that : It includes a starch grafted acrylic polymer dissolving box 120, a coal flow dust suppressant preparation box 130, a sodium dodecyl sulfate dissolving box 140, an agitator 150, a flow meter 160, a coal flow dust suppressant nozzle 170, a dust concentration measuring instrument 180, a control cabinet 190, a pump 220, and a stop valve 230. The starch grafted acrylic polymer dissolving box 120 and the sodium dodecyl sulfate dissolving box 140 are respectively connected to the coal flow dust suppressant preparation box 130. The starch grafted acrylic polymer dissolving box 120, the coal flow dust suppressant preparation box 130, and the sodium dodecyl sulfate dissolving box 140 are respectively provided with an agitator 150, and the coal flow dust suppressant The preparation box 130 is connected to the coal flow dust suppressant nozzle 170, and a flow meter 160, a pump 220, and a stop valve 230 are arranged between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170. The inlets of the starch grafted acrylic polymer solution box 120, the coal flow dust suppressant preparation box 130 and the sodium dodecyl sulfate solution box 140 are respectively provided with a pump 220, a stop valve 230, and a flow meter 160. A pump 220 and a stop valve 230 are respectively arranged between the starch grafted acrylic polymer solution box 120, the sodium dodecyl sulfate solution box 140 and the coal flow dust suppressant preparation box 130. The control cabinet 190 controls the automatic operation of the device.

4. A method for preparing a dynamic dust suppressant for an open-air coal yard, characterized in that Prepared by the following steps: (1) Add 1-2% starch grafted acrylic acid polymer and 0.03-0.5% sodium dodecyl sulfate into the starch grafted acrylic acid polymer solution box 120; (2) Add 0.1-0.5% acrylamide and 1-2% modified starch into the sodium dodecyl sulfate solution box 140; (3) Start the control cabinet 190 to start automatic dispensing; (4) The pump 220 and the stop valve 230 in front of the starch grafted acrylic polymer solution tank 120 and the sodium dodecyl sulfate solution tank 140 are turned on to automatically add 10% deionized water into the starch grafted acrylic polymer solution tank 120 and the sodium dodecyl sulfate solution tank 140, and the flow meter 160 measures the added salt water; (5) The agitator 150 in the starch grafted acrylic acid polymer solution box 120 and the sodium dodecyl sulfate solution box 140 is started to mix and blend the reagents and water; (6) Start the pump 220 and the stop valve 230 between the starch grafted acrylic polymer solution tank 120, the sodium dodecyl sulfate solution tank 140 and the coal flow dust suppressant preparation tank 130, add the solutions in the starch grafted acrylic polymer solution tank 120 and the sodium dodecyl sulfate solution tank 140 into the preparation tank, and start the agitator 150 in the coal flow dust suppressant preparation tank 130 to mix the two solutions evenly; (7) Start the pump 220 and the stop valve 230 on the front side of the coal flow dust suppressant preparation box 130, and add 80-85% desalted water and 3-5% coal powder; (8) Start the agitator 150 in the coal flow dust suppressant preparation box 130 to start stirring, control the speed to 2000r / min, and stir for 30 minutes until all reagents and solutions are evenly mixed, thus synthesizing the dynamic dust suppressant; 5. A method for spreading dynamic dust suppressant in an open-air coal yard, characterized in that Dispense by following these steps: (1) Place the coal flow dust suppressant nozzle 170 in the area where dust suppression is required; (2) Start the dust concentration measuring instrument 180 to detect the dust concentration; (3) Start the control cabinet 190 and enter the spreading mode; (4) Start the pump 220 between the coal flow dust suppressant preparation box 130 and the coal flow dust suppressant nozzle 170, and the coal flow dust suppressant nozzle 170 sprays the suppressant onto the coal flow.

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