CN212292953U - Efficient coal slime pretreatment of water system of power coal preparation plant - Google Patents
Efficient coal slime pretreatment of water system of power coal preparation plant Download PDFInfo
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- CN212292953U CN212292953U CN202021116538.6U CN202021116538U CN212292953U CN 212292953 U CN212292953 U CN 212292953U CN 202021116538 U CN202021116538 U CN 202021116538U CN 212292953 U CN212292953 U CN 212292953U
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Abstract
The utility model discloses an efficient coal slime pretreatment system of a power coal preparation plant, which comprises a coal slime pretreatment unit, a coal slime pH value adjusting unit, a coal slime concentration adjusting unit and a coal slime granularity monitoring and alarming unit; the utility model discloses confirm the optimum pan feeding concentration and the pH value that the coal slime water subsides, and through the utility model discloses coal slime water pretreatment systems, the coal slime water concentration and the pH value that will get into concentrated pond are stabilized at optimum parameter, guarantee that the medicament adds concentrated pond with minimum addition, reduce the medicament cost, reduce the production accident rate.
Description
The technical field is as follows:
the utility model relates to a coal slime pretreatment of water system especially relates to an efficient power coal preparation plant coal slime pretreatment of water system.
Background art:
at present, the consumption of the power coal accounts for about 70% of the total coal consumption in China, the conventional power coal preparation plant generally adopts a lump coal dense medium coal preparation and slack coal non-washing process, the proportion of raw coal to be selected is less than 50%, in order to improve the raw coal selection rate, more and more power coal preparation plants also adopt a dense medium cyclone separation process to separate slack coal with the granularity of less than 13mm, and because the fine coal is completely washed, the coal slime entering a coal slime water system is greatly increased, the coal slime water concentration is multiplied, the coal slime water viscosity is increased, and a large amount of coal slime water which is difficult to treat is generated. And along with the continuous deep mining of the mine, the raw coal entering the coal washing plant becomes poor, the concentration and pH value of the coal slime water fluctuate greatly, so that the dosage cannot be accurately controlled, and the treatment difficulty of the coal slime water is further increased. The traditional coal slime water concentration process cannot be well adapted to the change of mine raw coal, the concentration of clarified water after concentration is too high, the requirement that the first-stage washing water of dense medium coal separation is less than or equal to 0.5g/L cannot be met, and medium removal cannot be normally carried out; the chemical adding amount is too large, and once chemical adding is controlled improperly, coal slime sedimentation is caused too fast or too slow, so that circulating water cannot be reused, and the pressure harrow of the concentration machine cannot be started. In addition, the traditional slime water concentration process cannot monitor the granularity of slime water, and has the problems that the slime water runs out and is too coarse to settle, the concentrated slime is accumulated too much in a short time and exceeds the processing capacity of a filter press, and a coal preparation plant stops production. Therefore, once the coal slime water treatment system has problems, the production management of the coal preparation plant is greatly influenced, the operation cost of the coal preparation plant is increased, and the economic benefit of an enterprise is further reduced. Therefore, the existing concentration process needs to be improved, each process parameter of the slime water entering a concentration system is stabilized as much as possible, and the pressure of the slime water treatment system on economy and environmental protection is reduced.
The utility model has the following contents:
an object of the utility model is to provide a high-efficient, low-cost power coal preparation plant coal slime pretreatment of water system.
The purpose of the utility model is implemented by the following technical scheme: a high-efficiency coal slurry pretreatment system of a power coal preparation plant comprises a coal slurry pretreatment unit, a coal slurry pH value adjusting unit, a coal slurry concentration adjusting unit and a coal slurry granularity monitoring and alarming unit;
the coal slime water pretreatment unit comprises a pretreatment barrel, the lower part of the pretreatment barrel is communicated with a feeding pipe, an overflow weir is arranged above the inner part of the pretreatment barrel, the barrel wall of the pretreatment barrel opposite to the overflow weir is communicated with an overflow water pipe, a chemical feeding port is arranged on the pipe wall of the overflow water pipe, and a discharge port is arranged below the pretreatment barrel; the device also comprises a pH value adjusting feed pipe and a concentration adjusting water inlet pipe, wherein the outlet end of the pH value adjusting feed pipe and the outlet end of the concentration adjusting water inlet pipe are both communicated with the feed pipe;
the pH value adjusting valve of the slime water pH value adjusting unit is arranged on the pH value adjusting feeding pipe, and the pH monitor of the slime water pH value adjusting unit is arranged on the overflow water pipe;
the concentration regulating valve of the slime water concentration regulating unit is arranged on the concentration regulating water inlet pipe, and the concentration monitor of the slime water concentration regulating unit is arranged on the overflow water pipe;
the coal slime water granularity monitoring and alarming unit is arranged on the feeding pipe.
Preferably, the exit end of inlet pipe extends to the inside of preliminary treatment bucket, just the exit end of inlet pipe is decurrent scarf, is convenient for stabilize the pan feeding.
Preferably, an overflow water outlet of a concentration tank of the slime water treatment system is connected with the inlet end of the pH value adjusting feeding pipe and the inlet end of the concentration adjusting water inlet pipe.
Preferably, the slime water pH value adjusting unit comprises a pH value adjusting valve, a pH monitor and a pH value adjusting controller, wherein a signal output end of the pH monitor is connected with a signal input end of the pH value adjusting controller, and a signal output end of the pH value adjusting controller is connected with a signal input end of the pH value adjusting valve.
Preferably, the coal slime water concentration adjusting unit includes the concentration adjusting valve concentration monitor and concentration adjusting controller, the signal output part of concentration monitor with the signal input part of concentration adjusting controller is connected, the signal output part of concentration adjusting controller with the signal input part of concentration adjusting valve is connected.
Preferably, the coal slime water granularity monitoring and alarm unit includes granularity monitor, granularity alarm control ware and alarm, the signal output part of granularity monitor with granularity alarm control ware's signal input part is connected, granularity alarm control ware's signal output part with the signal input part of alarm is connected.
The utility model has the advantages that: 1. the utility model determines the optimal feeding concentration and the pH value of the sedimentation of the slime water, and through the slime water pretreatment system, the slime water concentration and the pH value entering the concentration tank are stabilized at the optimal parameters, the medicament is ensured to be added into the concentration tank with the lowest addition amount, the medicament cost is reduced, and the production accident rate is reduced; meanwhile, automatic continuous adjustment is realized, the concentration of the concentrated clarified water can meet the requirement of the heavy-medium coal separation first-stage washing water, the discharge amount of slime water is reduced, and the consumption of the heavy-medium coal separation first-stage washing water on fresh water is saved. 2. The granularity monitoring and alarming system can monitor the granularity condition in the slime water on line, find that the granularity exceeds 0.25mm, alarm in time, avoid the slime water from going coarse and settling too fast, and reduce the production accident rate. 3. The utility model discloses with coal slime water processing system's concentrated pond overflow water as the moisturizing of adjusting coal slime water concentration and pH value, need not to consume fresh water, the treatment cost is low.
Description of the drawings:
FIG. 1 is a schematic diagram of a high-efficiency coal slurry pretreatment system of a power coal preparation plant.
FIG. 2 is a graph showing the relationship between the concentration of slime water and the dosage.
FIG. 3 is a graph of pH value versus coal slurry settling time.
The device comprises a coal slime water pretreatment unit 1, a pretreatment barrel 1-1, a feeding pipe 1-2, a discharging port 1-3, an overflow weir 1-4, an overflow water pipe 1-5, a dosing port 1-6, a pH value adjusting feeding pipe 1-7, a concentration adjusting water inlet pipe 1-8, a coal slime water pH value adjusting unit 2, a pH value adjusting valve 2-1, a pH monitor 2-2, a pH value adjusting controller 2-3, a coal slime water concentration adjusting unit 3, a concentration adjusting valve 3-1, a concentration monitor 3-2, a concentration adjusting controller 3-3, a coal slime water granularity monitoring and alarming unit 4, a granularity monitor 4-1 and a granularity alarming controller 4-2.
The specific implementation mode is as follows:
example 1: a high-efficiency coal slurry pretreatment system of a power coal preparation plant comprises a coal slurry pretreatment unit 1, a coal slurry pH value adjusting unit 2, a coal slurry concentration adjusting unit 3 and a coal slurry granularity monitoring and alarming unit 4;
the coal slime water pretreatment unit 1 comprises a pretreatment barrel 1-1, the lower part of the pretreatment barrel 1-1 is communicated with a feeding pipe 1-2, the outlet end of the feeding pipe 1-2 extends to the inside of the pretreatment barrel 1-1, and the outlet end of the feeding pipe 1-2 is a downward inclined cut. An overflow weir 1-4 is arranged above the interior of the pretreatment barrel 1-1, the barrel wall of the pretreatment barrel 1-1 opposite to the overflow weir 1-4 is communicated with an overflow water pipe 1-5, a dosing port 1-6 is arranged on the pipe wall of the overflow water pipe 1-5, and a discharge port 1-3 is arranged below the pretreatment barrel 1-1; the device also comprises a pH value adjusting feed pipe 1-7 and a concentration adjusting water inlet pipe 1-8, wherein the outlet end of the pH value adjusting feed pipe 1-7 and the outlet end of the concentration adjusting water inlet pipe 1-8 are both communicated with the feed pipe 1-2; an overflow water outlet of a concentration tank of the slime water treatment system is connected with the inlet ends of the pH value adjusting feeding pipes 1 to 7 and the inlet ends of the concentration adjusting water inlet pipes 1 to 8.
The slime water pH value adjusting unit 2 comprises a pH value adjusting valve 2-1, a pH monitor 2-2 and a pH value adjusting controller 2-3, wherein the signal output end of the pH monitor 2-2 is connected with the signal input end of the pH value adjusting controller 2-3, and the signal output end of the pH value adjusting controller 2-3 is connected with the signal input end of the pH value adjusting valve 2-1. The pH value adjusting valve 2-1 is arranged on the pH value adjusting feeding pipe 1-7, and the pH monitor 2-2 is arranged on the overflow water pipe 1-5; the pH monitor 2-2 of this embodiment is manufactured by Hangzhou American automated technology, Inc. and has a model number of MIK-PH 6.0.
The coal slime water concentration adjusting unit 3 comprises a concentration adjusting valve 3-1, a concentration monitor 3-2 and a concentration adjusting controller 3-3, wherein a signal output end of the concentration monitor 3-2 is connected with a signal input end of the concentration adjusting controller 3-3, and a signal output end of the concentration adjusting controller 3-3 is connected with a signal input end of the concentration adjusting valve 3-1. The concentration regulating valve 3-1 is arranged on the concentration regulating water inlet pipe 1-8, and the concentration monitor 3-2 is arranged on the overflow water pipe 1-5; the concentration monitor 3-2 of this example was manufactured by Amer, Germany, and has a model number of OUS 41-W2.
The coal slime water granularity monitoring and alarming unit 4 comprises a granularity monitor 4-1, a granularity alarm controller 4-2 and an alarm, wherein the signal output end of the granularity monitor 4-1 is connected with the signal input end of the granularity alarm controller 4-2, and the signal output end of the granularity alarm controller 4-2 is connected with the signal input end of the alarm. The granularity monitor 4-1 is arranged on the feeding pipe 1-2. The particle size monitor 4-1 of the present embodiment is manufactured by the measurement and control technology ltd of east Dandong, and is of the type DF-PSM.
In the embodiment, the pH value adjusting controller 2-3, the concentration adjusting controller 3-3 and the granularity alarming controller 4-2 are integrated on one main control box 5, and meanwhile, the main control box 5 can be communicated with a dosing system and a main PLC system of a coal preparation plant.
the pH monitor 2-2 transmits the monitored pH value of the slime water to the pH value adjusting controller 2-3, the pH value adjusting controller 2-3 compares the pH value with a pH set value through the pH monitoring value, and if the pH value is higher than the upper limit value of the pH set value, the pH value adjusting controller 2-3 sends an instruction to adjust the pH value adjusting valve 2-1 to increase the opening degree and increase the water supplement amount; if the pH monitoring value is lower than the lower limit value of the pH set value, the pH value adjusting controller 2-3 sends an instruction to adjust the pH value adjusting valve 2-1 to reduce the opening degree and reduce the water supplement amount; if the pH monitoring value is between the upper limit value and the lower limit value of the pH set value, the pH value regulating valve 2-1 keeps the original opening unchanged; as shown in FIG. 3, the pH value of this example was set to 6-8 and the settling time was 10-11s at the shortest.
The concentration monitor 3-2 transmits a monitored coal slime water concentration monitoring value to the concentration adjusting controller 3-3, the concentration adjusting controller 3-3 compares the concentration monitoring value with a concentration set value, and if the concentration monitoring value is higher than an upper limit value of the concentration set value, the concentration adjusting controller 3-3 sends an instruction to adjust the concentration adjusting valve 3-1 to increase the opening and increase the water supplement amount; if the concentration monitoring value is lower than the upper limit value of the concentration set value, the concentration regulating valve 3-1 keeps the original opening unchanged; as shown in figure 2, the unit dosage begins to increase when the feed concentration is 60-120 g/L; the feed concentration is more than 120g/L, the unit dosing amount is greatly increased, the concentration set value of the embodiment is not more than 60g/L, and the dosing amount is the least.
The granularity monitor 4-1 transmits the detected granularity monitoring value to the granularity alarm controller 4-2, and the granularity alarm controller 4-2 controls the alarm to alarm if the granularity monitoring value exceeds the granularity set value after comparing the granularity monitoring value with the granularity set value. The particle size setting for this example was 0.25 mm.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A high-efficiency coal slurry pretreatment system of a power coal preparation plant is characterized by comprising a coal slurry pretreatment unit, a coal slurry pH value adjusting unit, a coal slurry concentration adjusting unit and a coal slurry granularity monitoring and alarming unit;
the coal slime water pretreatment unit comprises a pretreatment barrel, the lower part of the pretreatment barrel is communicated with a feeding pipe, an overflow weir is arranged above the inner part of the pretreatment barrel, the barrel wall of the pretreatment barrel opposite to the overflow weir is communicated with an overflow water pipe, a chemical feeding port is arranged on the pipe wall of the overflow water pipe, and a discharge port is arranged below the pretreatment barrel; the device also comprises a pH value adjusting feed pipe and a concentration adjusting water inlet pipe, wherein the outlet end of the pH value adjusting feed pipe and the outlet end of the concentration adjusting water inlet pipe are both communicated with the feed pipe;
the pH value adjusting valve of the slime water pH value adjusting unit is arranged on the pH value adjusting feeding pipe, and the pH monitor of the slime water pH value adjusting unit is arranged on the overflow water pipe;
the concentration regulating valve of the slime water concentration regulating unit is arranged on the concentration regulating water inlet pipe, and the concentration monitor of the slime water concentration regulating unit is arranged on the overflow water pipe;
the coal slime water granularity monitoring and alarming unit is arranged on the feeding pipe.
2. A high efficiency coal slurry pretreatment system for a power coal preparation plant as recited in claim 1, wherein said outlet end of said feed pipe extends into the interior of said pretreatment tank and is chamfered downwardly.
3. The system of claim 1, wherein the overflow outlet of the concentration tank of the coal slurry treatment system is connected to the inlet of the pH adjusting feed pipe and the inlet of the concentration adjusting water inlet pipe.
4. The system as claimed in any one of claims 1 to 3, wherein the slurry water pH value adjusting unit comprises the pH value adjusting valve, the pH monitor and a pH value adjusting controller, the signal output terminal of the pH monitor is connected to the signal input terminal of the pH value adjusting controller, and the signal output terminal of the pH value adjusting controller is connected to the signal input terminal of the pH value adjusting valve.
5. The system as claimed in any one of claims 1 to 3, wherein the coal slurry water concentration adjusting unit comprises the concentration adjusting valve, the concentration monitor and a concentration adjusting controller, the signal output terminal of the concentration monitor is connected to the signal input terminal of the concentration adjusting controller, and the signal output terminal of the concentration adjusting controller is connected to the signal input terminal of the concentration adjusting valve.
6. The system of any one of claims 1 to 3, wherein the coal slurry particle size monitoring and alarming unit comprises a particle size monitor, a particle size alarm controller and an alarm, the signal output end of the particle size monitor is connected with the signal input end of the particle size alarm controller, and the signal output end of the particle size alarm controller is connected with the signal input end of the alarm.
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| CN112239253A (en) * | 2020-06-16 | 2021-01-19 | 鄂尔多斯市中钰泰德煤炭有限公司 | Efficient coal slurry pretreatment system and method for power coal preparation plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112239253A (en) * | 2020-06-16 | 2021-01-19 | 鄂尔多斯市中钰泰德煤炭有限公司 | Efficient coal slurry pretreatment system and method for power coal preparation plant |
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