CN112354264B - Energy-saving gas pump set combined transportation system used under complex gas extraction working condition and control method - Google Patents
Energy-saving gas pump set combined transportation system used under complex gas extraction working condition and control method Download PDFInfo
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- CN112354264B CN112354264B CN202011195613.7A CN202011195613A CN112354264B CN 112354264 B CN112354264 B CN 112354264B CN 202011195613 A CN202011195613 A CN 202011195613A CN 112354264 B CN112354264 B CN 112354264B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D36/04—Combinations of filters with settling tanks
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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Abstract
The invention discloses an energy-saving gas pump set combined transportation system and a control method under a complex gas extraction working condition. During gas extraction, gas containing a large amount of coal dust enters a gas extraction pump set, a working liquid-coal dust mixture is discharged to an inclined plate type water bath cooling box through a gas-liquid separator to carry out forced precipitation and primary cooling of the coal dust, then enters the gas extraction pump set again through a mining thick slurry pump, a secondary cooling device and a high-position filter tank, and intelligent preparation, liquid supplementing and self-adaptive adjustment of optimal energy-saving viscosity of the working liquid are realized by carrying out interlocking control on the liquid level and the viscosity of the working liquid; the intelligent pollution discharge and purification of the working solution are realized by performing interlocking control on the coal dust concentration and the coal slime height of the working solution. The invention can realize the high-efficiency energy-saving, safe and reliable operation of the gas pump under the severe extraction condition, has high intelligent level, and is particularly suitable for large-scale (super-large) ground gas extraction pump stations with large coal dust content and poor extraction working conditions, such as coal seam drill holes or upper corners of working faces in coal mines in China.
Description
Technical Field
The invention relates to the technical field of coal mine gas extraction, in particular to an energy-saving gas pump set combined transportation system and a control method under a complex gas extraction working condition, and is particularly suitable for gas extraction points which contain more coal dust impurities and have severe working conditions, such as coal seam drill holes or upper corners of working faces.
Background
The gas extraction pump is widely applied to a coal mine gas extraction system, has the outstanding advantages of simple structure, safety, reliability and the like, and is a high-energy-consumption device with low efficiency acknowledged in the industry. The high consumption and low efficiency of the gas pump become important technical bottlenecks which restrict the development of low-carbon, green and high-efficiency mines in China. Therefore, according to the gas-liquid two-phase flow characteristic and the energy loss mechanism in the gas extraction pump, technical personnel in the field innovatively provide a new technology for reducing the energy consumption of the gas extraction pump by using the anti-drag working fluid and develop a ground totally-enclosed gas pump energy-saving system, the system is mainly suitable for extraction places with less coal dust impurities and good water quality conditions, such as a high extraction roadway, a goaf and the like, and has a narrow application range in a coal mine and the following defects: (1) each gas pump needs to be independently provided with one energy-saving system, and a large-scale gas extraction pump station in China can be provided with 5-20 gas pumps, so that the problems of high construction difficulty, large engineering quantity, high cost and the like are caused; (2) the evaporation of working fluid in the gas pump can cause the viscosity of the drag reduction fluid to rise, when the viscosity is too high, liquid supply and flow cutoff can be formed to influence the stable operation of the pump, and the energy-saving effect of the technology can be influenced, and the problem is not considered in the prior art; (3) the drag reduction liquid in the circulating tank can be subjected to biodegradation or shear degradation, the viscosity change influences the energy-saving effect, and intelligent regulation and control cannot be realized; (4) hard particles (such as coal dust and the like) in the resistance reducing liquid cannot be effectively treated, so that the risks of pipeline blockage, serious pump body abrasion and the like exist, manual frequent pollution discharge is required, and the labor consumption is high.
At present, no gas pump set combined transportation energy-saving system based on high polymer resistance-reducing liquid is constructed aiming at the characteristics of large coal dust content, poor extraction working condition and the like of a ground large-scale (super-large-scale) gas extraction pump station, such as coal seam drilling or upper corner of a working face.
Disclosure of Invention
The invention aims to provide an energy-saving gas pump set combined transportation system used under a complex gas extraction working condition, which can adjust the optimal viscosity, liquid level and cleanliness of working liquid in real time according to the operation working condition of a gas extraction pump and ensure the efficient and stable operation of the gas pump.
The invention also aims to provide the control method of the energy-saving gas pump set combined transportation system, which has high intelligent degree and low labor cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an energy-saving gas pump set combined transportation system used under a complex gas extraction working condition comprises a gas extraction pump set operation system, a working solution circulating cooling system, a resistance-reducing working solution distribution and compensation integrated system, an in-pump self-adaptive constant viscosity system, a working solution intelligent purification system and a pump set PLC monitoring substation;
the gas extraction pump set operation system comprises a gas extraction pump set which is jointly transported by at least two gas extraction pumps, wherein an air inlet regulating valve and a gas comprehensive parameter tester are sequentially installed on an air inlet pipeline of each gas extraction pump, each gas extraction pump is respectively connected with a gas-liquid separator, an air outlet at the top of the gas-liquid separator is connected with an air outlet pipeline, and each gas extraction pump is also respectively connected with a set of mine electrical parameter measuring instrument;
the working solution circulating cooling system comprises an inclined plate type water bath cooling box, a mining thick slurry pump, a low-level cold water pool, a secondary cooling device, a high-level filter pool and a temperature sensor, wherein a bottom liquid outlet of the gas-liquid separator is connected with the inclined plate type water bath cooling box through a liquid outlet pipeline, the inclined plate type water bath cooling box is arranged in the low-level cold water pool, a liquid outlet of the inclined plate type water bath cooling box is sequentially connected with the mining thick slurry pump, the secondary cooling device, the high-level filter pool, the temperature sensor and a gas extraction pump set through a liquid inlet pipeline, and a liquid inlet end of the mining thick slurry pump and a liquid outlet end of the high-level filter pool are respectively provided with a manual regulating valve;
the resistance-reducing working fluid preparation and supplement integrated system comprises a full-automatic resistance-reducing fluid preparation device, a fluid infusion pump, a pipeline pump, an electric switch valve I, an electromagnetic flowmeter I, a liquid level sensor I and a viscosity sensor I, wherein a variable-frequency feeding machine is arranged at the top of the full-automatic resistance-reducing fluid preparation device, a liquid level sensor II is arranged in a preparation tank of the full-automatic resistance-reducing fluid preparation device, the full-automatic resistance-reducing fluid preparation device is connected with the fluid infusion pump and the inclined plate type water bath cooling tank through a fluid infusion pipeline, a low-level cold water pool is sequentially connected with the pipeline pump, the electric switch valve I, the electromagnetic flowmeter I and the full-automatic resistance-reducing fluid preparation device through a water inlet pipeline, and the liquid level sensor I and the viscosity sensor I are both arranged in the inclined plate type water bath cooling tank;
the self-adaptive constant viscosity system in the pump comprises a water supply pump, an electric regulating valve, a viscosity sensor II and an electromagnetic flowmeter II, wherein the electric regulating valve and the electromagnetic flowmeter II are the same as the gas extraction pump in number, the viscosity sensor II is connected with the gas-liquid separator, and the low-level cold water tank is sequentially connected with the water supply pump, the electric regulating valve, the electromagnetic flowmeter II and the gas extraction pump group through a shaft seal water supply pipeline;
the intelligent working solution purification system comprises a sewage pump, an electric switch valve II, a sludge storage tank, a sludge level meter and a coal powder concentration sensor, wherein the sludge level meter and the coal powder concentration sensor are all arranged in the inclined plate type water bath cooling box;
pump package PLC control substation include PLC switch board and host computer, gas comprehensive parameter tester, mining electrical parameter measuring apparatu, temperature sensor, electromagnetic flow meter I, electromagnetic flow meter II, level sensor I, level sensor II, viscosity sensor I, viscosity sensor II, mud level gauge and buggy concentration sensor respectively with PLC switch board input signal connection, PLC switch board output respectively with full-automatic drag reduction liquid preparation device, frequency conversion feeding machine, the fluid infusion pump, the tubing pump, electric switch valve I, electric control valve, electric switch valve II, dredge pump signal connection, PLC switch board and host computer electric connection.
Furthermore, the flow rates of the pipeline pump and the fluid infusion pump are consistent.
Preferably, the number of the combined transportation pumps of the gas extraction pump set is 2-20 gas extraction pumps.
Further, the upper part of the inclined plate type water bath cooling box is provided with partial inclined plates, the distance between the inclined plates is 50-150 mm, and the inclination angle of the inclined plates is 30-60 degrees.
Preferably, the number of the sludge storage tanks is 2-5.
Furthermore, a filter screen is arranged at the liquid outlet of the high-position filter tank, and the mesh number of the filter screen is 100-140 meshes.
The invention also provides a control method of the energy-saving gas pump set combined transportation system used under the complex gas extraction working condition, which comprises the following steps:
(1) the liquid level and the viscosity in the inclined plate type water bath cooling tank are subjected to interlocking control through a pump set PLC monitoring substation, and are compared with a parameter threshold value;
(2) performing stable viscosity control on the viscosity in the gas extraction pump through a pump set PLC monitoring substation;
(3) and the pump set PLC monitors the substation to perform interlocking control on the coal dust concentration and the coal slime height of the working solution in the inclined plate type water bath cooling box, and compares the coal dust concentration and the coal slime height with a parameter threshold value.
The specific implementation process of the step (1) is as follows: if the liquid level of the inclined plate type water bath cooling box is less than (h min+ 0.3), then send instruction to PLC control cabinet to open the full-automatic drag reduction liquid preparing device, and monitor the liquid level in the device, when the liquid level in the preparing tank reaches the highest liquid levell maxStopping the full-automatic damping fluid preparation device; when the liquid level of the inclined plate type water bath cooling tank is less thanh minWhen the system is started, the pipeline pump, the electric switch valve I, the full-automatic drag reduction liquid preparation device and the fluid infusion pump are started until the highest liquid level of the liquid in the inclined plate type water bath cooling tank is achievedh maxStopping the preparation and fluid infusion procedures;
if the liquid level of the inclined plate type water bath cooling tank is more than or equal to (h min+ 0.3) and below the maximum liquid levelh maxAnd judging the viscosity of the monitored working fluid: if the viscosity is greater than or equal to the optimal energy-saving viscosityη oIf the data is 85%, transmitting the acquired data to an upper computer for data storage and starting the next round of monitoring; if the viscosity is less than 85% of the optimal energy-saving viscosity, judging the liquid level and the highest liquid levelh maxIs less than the maximum at the liquid levelAfter 80% of the high liquid level, sending an instruction to a PLC control cabinet to start a full-automatic drag reduction liquid preparation device and a variable-frequency feeder to prepare high-viscosity drag reduction liquid, simultaneously starting a liquid supplementing pump, and monitoring the liquid level and the viscosity value in real time; when the liquid level is less than the highest liquid levelh maxAnd a viscosity equal toη oWhen the viscosity regulation is finished, the next round of monitoring is carried out; when the liquid level is less thanh maxBut has a viscosity of less thanη oWhen the liquid is needed, the liquid is continuously replenished; when the liquid level is equal toh maxAnd stopping the preparation and liquid supplementing procedures and entering the liquid level monitoring stage again.
Wherein, the specific implementation process of the step (2) is as follows: setting an initial value of shaft seal water supply amount and the opening of an electric regulating valve according to an empirical formula of liquid temperature and water evaporation amount in a gas-liquid separator; viscosity in gas-liquid separator collected with delay of 15 min: if the viscosity is 0.85 or moreη oAnd is not more than 1.15η oTransmitting the acquired data to an upper computer for data storage and starting the next round of monitoring;
if the viscosity is less than 0.85η o(or greater than 1.15)η o) Then sending an instruction to the PLC control cabinet to adjust the opening degree of the electric control valvef kReducing (increasing) by 5%, delaying the viscosity in the gas-liquid separator collected for 15min, and maintaining the measured viscosity at 0.85η oTo 1.15η oIn between, the optimal valve opening and the corresponding shaft seal water supply are found.
Wherein, the specific implementation process of the step (3) is as follows: if the concentration of the coal dust is lower than 1%, judging the height of the coal slurry in the next step: if the height of the coal slime is lower than 0.1m, transmitting the acquired data to an upper computer for data storage and starting the next round of monitoring; if the height of the coal slime is more than or equal to 0.1m, starting a sewage pump and an electric switch valve II, when the coal slime is discharged to the height of 0, closing the sewage pump and the electric switch valve II, stopping discharging the coal slime, and starting the next round of monitoring;
if the concentration of the pulverized coal is higher than 1%, a sewage pump and an electric switch valve II are started until the liquid level in the inclined plate type water bath cooling box is reduced to the levelh minAnd stopping sewage discharge and starting the next monitoring.
Compared with the prior art, the invention has the following beneficial effects:
1. the energy-saving gas pump set combined transportation system provided by the invention can simultaneously and jointly transport 2-20 gas extraction pumps, the defect of independent operation of a traditional single system is overcome, the engineering quantity is small, and the investment cost is low; the large-particle pulverized coal forced precipitation function of the inclined plate in the inclined plate type water tank and the small-particle secondary filtering function of the high-position filtering tank are utilized, and the PLC intelligent pollution discharge program is assisted, so that the full purification of each particle size in the working liquid is realized, and the fault-free operation period of the gas pump is greatly prolonged; by utilizing a double heat exchange cooling scheme of 'water bath type primary cooling + secondary cooling', the working liquid is fully cooled, and the gas extraction flow of a gas pump is increased; the stable viscosity effect of the anti-drag working fluid is realized through the self-adaptive adjustment of the water supply amount of the shaft seal, the running stability of the gas pump is improved, and the consumption cost of the anti-drag working fluid can be greatly reduced; through the logic program design of mainly liquid level and secondarily viscosity, the reliable operation of the gas extraction pump station is guaranteed, and the maximum energy conservation of the pump station is further realized.
2. The energy-saving gas pump set combined transportation system provided by the invention can greatly reduce the energy consumption of a gas extraction system, realizes the constant-viscosity and stable-viscosity effects and the purification effect of the drag reduction liquid, and is particularly suitable for large-scale (super-large) gas extraction pump stations on the ground with large coal dust content and poor extraction working conditions, such as coal seam drill holes or upper corners of working faces in coal mines in China. The system is simple to operate, safe, reliable, high in intelligent degree, obvious in energy-saving effect and wide in applicability.
Drawings
FIG. 1 is a schematic view of an energy-saving gas pump unit intermodal system of the invention;
FIG. 2 is a flow chart of a control method of the drag reduction working fluid distribution and compensation integrated system of the present invention;
FIG. 3 is a flow chart of a method of controlling the adaptive in-pump constant viscosity system of the present invention;
FIG. 4 is a flow chart of a control method of the intelligent working fluid purification system.
In the figure: 1. a gas extraction pump; 2. a gas-liquid separator; 3. an air intake line; 4. an exhaust line; 5. a gas comprehensive parameter tester; 6. an air inlet regulating valve; 7. a mine electrical parameter measuring instrument; 8. a swash plate water bath cooling tank; 9. a thick slurry pump for mining; 10. a low-level cold water pool; 11. a secondary cooling device; 12. a high-level filtering tank; 13. a liquid inlet pipeline; 14. a drainage line; 15. a manual regulating valve; 16. a temperature sensor; 17. a full-automatic drag reduction liquid preparation device; 18. a liquid supplementing pump; 19. a pipeline pump; 20. an electric switch valve I; 21. an electromagnetic flow meter I; 22. a liquid level sensor I; 23. a viscosity sensor I; 24. a liquid supplementing pipeline; 25. a water inlet pipeline; 26. a water supply pump; 27. shaft sealing the water supply pipeline; 28. an electric control valve; 29. a viscosity sensor II; 30. an electromagnetic flow meter II; 31. a sewage pump; 32. an electric switch valve II; 33. a sewage draining pipeline; 34. a sludge storage tank; 35. a mud level meter; 36. a pulverized coal concentration sensor; 37. a PLC control cabinet; 38. an upper computer; 39. a variable frequency feeder; 40. and a liquid level sensor II.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in figure 1, the energy-saving gas pump set combined transportation system used under the complex gas extraction working condition comprises a gas extraction pump set operation system, a working solution circulating cooling system, a resistance-reducing working solution distribution and compensation integrated system, an in-pump self-adaptive constant viscosity system, a working solution intelligent purification system and a pump set PLC monitoring substation.
The gas extraction pump set operation system comprises a gas extraction pump set which is formed by 2-20 gas extraction pumps 1 in a combined transportation mode, wherein an air inlet adjusting valve 6 and a gas comprehensive parameter tester 5 are sequentially installed on an air inlet pipeline 3 of each gas extraction pump 1, each gas extraction pump 1 is respectively connected with a gas-liquid separator 2, a top air outlet of the gas-liquid separator 2 is connected with an air exhaust pipeline 4, and each gas extraction pump 1 is further respectively connected with a set of mining electrical parameter measuring instrument 7.
The working solution circulating cooling system comprises an inclined plate type water bath cooling box 8, a mining thick slurry pump 9, a low-level cold water pool 10, a secondary cooling device 11, a high-level filtering pool 12 and a temperature sensor 16, the gas-liquid separator 2 can efficiently separate gas from working liquid, a liquid outlet at the bottom of the gas-liquid separator 2 is connected with the inclined plate type water bath cooling tank 8 through a liquid discharge pipeline 14, the inclined plate type water bath cooling tank 8 is arranged in the low-level cold water pool 10, used for carrying out primary cooling on working fluid and forced precipitation of large-particle coal powder, a liquid outlet of the inclined plate type water bath cooling box 8 is sequentially connected with the mining thick slurry pump 9, the secondary cooling device 11, the high-position filter tank 12, the temperature sensor 16 and the gas extraction pump set through a liquid inlet pipeline 13, a manual regulating valve 15 is respectively arranged at the liquid inlet end of the mining thick slurry pump 9 and the liquid outlet end of the high-position filtering tank 12; partial inclined plates are arranged at the upper part of the inclined plate type water bath cooling box 8, the distance between the inclined plates is 50-150 mm, and the inclination angle of the inclined plates is 30-60 degrees; the mining thick slurry pump 9 is suitable for conveying viscous drag reduction working fluid, and the secondary cooling device 11 is used for carrying out secondary cooling on the working fluid to further cool the working fluid; the liquid outlet of high-order filtering ponds 12 be equipped with the filter screen, the filter screen mesh number is 100~140 meshes for carry out secondary filter to the tiny particle buggy, further avoid the wearing and tearing ageing effect of gas pump.
The drag reduction working solution preparing and supplementing integrated system comprises a full-automatic drag reduction solution preparing device 17, a fluid infusion pump 18, a pipeline pump 19, an electric switch valve I20, an electromagnetic flow meter I21, a liquid level sensor I22 and a viscosity sensor I23, wherein the full-automatic drag reduction solution preparing device 17 is connected with the fluid infusion pump 18 and the inclined plate type water bath cooling tank 8 through a fluid infusion pipeline 24, the low-level cold water tank 10 is sequentially connected with the pipeline pump 19, the electric switch valve I20, the electromagnetic flow meter I21 and the full-automatic drag reduction solution preparing device 17 through a water inlet pipeline 25, and the liquid level sensor I22 and the viscosity sensor I23 are both arranged in the inclined plate type water bath cooling tank 8; the top of the full-automatic drag reduction liquid preparation device 17 is provided with a variable frequency feeder 39, which can quantitatively prepare drag reduction liquids with different viscosities to realize two functions: 1. preparing resistance reducing liquid with optimal viscosity when the liquid level is insufficient; 2. the high viscosity drag reducing fluids are formulated at lower viscosities to more quickly achieve the optimum energy saving viscosity. In addition, a liquid level sensor II40 is installed in the preparation tank, and the flow of the pipeline pump 19 connected with the full-automatic drag reduction liquid preparation device 17 is consistent with that of the fluid infusion pump 18, so that balanced liquid inlet and outlet is realized.
The self-adaptive constant viscosity system in the pump comprises a water supply pump 26, an electric regulating valve 28, a viscosity sensor II29 and an electromagnetic flowmeter II30, wherein the electric regulating valve 28 and the electromagnetic flowmeter II30 are the same as the gas extraction pump 1 in number, the viscosity sensor II29 is connected with the gas-liquid separator 2, and the low-level cold water pool 10 is sequentially connected with the water supply pump 26, the electric regulating valve 28, the electromagnetic flowmeter II30 and the gas extraction pump group through a shaft seal water supply pipeline 27;
the intelligent working solution purification system comprises a sewage pump 31, an electric switch valve II32, sludge storage tanks 34, sludge level meters 35 and pulverized coal concentration sensors 36, wherein the sludge storage tanks 34 are arranged at the bottom of the inclined plate type water bath cooling box 8, the number of the sludge storage tanks is 2-5, the bottoms of the sludge level meters 35 extend into the sludge storage tanks 34, the pulverized coal concentration sensors 36 are arranged in the inclined plate type water bath cooling box 8, and the sludge storage tanks 34 are sequentially connected with the electric switch valve II32 and the sewage pump 31 through sewage pipes 33;
the pump set PLC monitoring substation comprises a PLC control cabinet 37 and an upper computer 38, the gas comprehensive parameter tester 5, the mining electric parameter measuring instrument 7, the temperature sensor 16, the electromagnetic flow meter I21, the electromagnetic flow meter II30, the liquid level sensor I22, the liquid level sensor II40, the viscosity sensor I23, the viscosity sensor II29, the mud level meter 35 and the coal powder concentration sensor 36 are respectively in signal connection with the input end of the PLC control cabinet 37, the output end of the PLC control cabinet 37 is respectively in signal connection with the full-automatic drag reduction liquid preparation device 17, the variable-frequency feeder 39, the fluid infusion pump 18, the pipeline pump 19, the electric switch valve I20, the electric regulating valve 28, the electric switch valve II32 and the sewage pump 31, and the PLC control cabinet 37 is electrically connected with the upper computer 38; the gas comprehensive parameter tester 5 is used for monitoring the flow, concentration and negative pressure of gas on the gas inlet pipeline 3, the mining electric parameter measuring instrument 7 is used for monitoring the shaft power of a motor of the gas extraction pump 1, the temperature sensor 16 is used for monitoring the temperature of working liquid, the electromagnetic flow meter I21 and the electromagnetic flow meter II30 are respectively used for monitoring the water flow of the water inlet pipeline 25 and the water supply flow of the shaft seal water supply pipeline 27, the liquid level sensor I22 and the liquid level sensor II40 are respectively used for monitoring the liquid levels of the inclined plate type water bath cooling tank 8 and the full-automatic drag reduction liquid preparation device 17, the viscosity sensor I23 and the viscosity sensor II29 are respectively used for monitoring the viscosity of the inclined plate type water bath cooling tank 8 and the gas-liquid separator 2, and the mud level meter 35 and the coal powder concentration sensor 36 are respectively used for monitoring the coal slurry height in the inclined plate type water bath cooling tank 8 and the coal powder concentration contained in the working liquid. The upper computer 38 is responsible for collecting gas comprehensive parameter tester 5, mining electric parameter measuring instrument 7, temperature sensor 16, electromagnetic flow meter I21 and electromagnetic flow meter II30, liquid level sensor I22 and liquid level sensor II40, viscosity sensor I23 and viscosity sensor II29, gas extraction parameters fed back by mud level meter 35 and coal dust concentration sensor 36, motor shaft power, temperature, flow, liquid level, viscosity, coal slime height and coal dust concentration signals, and accordingly accurately controls the drag reduction working fluid distribution and compensation integrated system, the self-adaptive constant viscosity system in the pump and the working fluid intelligent purification system.
As shown in fig. 2, the pump set PLC monitoring substation is used to perform interlocking control on the liquid level and viscosity in the swash plate type water bath cooling tank, and compares the liquid level and viscosity with the parameter threshold, and the specific steps are as follows:
if the liquid level of the inclined plate type water bath cooling box 8 is less than (h min+ 0.3), an instruction is sent to the PLC control cabinet 37 to start the full-automatic drag reducing fluid preparation device 17 (aboveh min0.3m in advance for reserving sufficient liquid preparation time to prevent the liquid from being replenished in time), when the liquid level in the full-automatic drag reduction liquid preparation device 17 reaches the maximum liquid levell maxWhen the resistance reducing liquid is prepared, stopping preparing the resistance reducing liquid; along with the prolonging of the operation time, the drag reduction liquid is further consumed, and when the liquid level of the inclined plate type water bath cooling box 8 is less than that of the inclined plate type water bath cooling boxh minWhen the flow rate of the drag reducing liquid is short, the flow rate can be properly increased to reduce the liquid preparation time, and when the flow rate is supplemented to the highest liquid level of the inclined plate type water bath cooling tank 8, the liquid preparation program is started, the full-automatic drag reducing liquid preparation device 17 is started, the liquid preparation program is started again, and the pipeline pump 19 and the liquid supplementing pump 18 are started (the flow rates of the two are required to be consistent, the flow rate is related to the dissolution time of the drag reducing liquid, and when the dissolution time is short, the flow rate can be properly increased to reduce the liquid preparation time), the highest liquid level is supplemented toh maxAnd stopping the preparation and liquid supplementing procedures, and closing the pipeline pump 19 for supplying water to the inclined plate type water bath cooling tank 8.
If the liquid level of the inclined plate type water bath cooling tank 8 is more than or equal to (h min+ 0.3) and less thanMaximum liquid levelh maxAnd the liquid level of the resistance reducing liquid in the tank is in a normal working range, the viscosity of the monitored working liquid is judged in the next step: if the viscosity is greater than or equal to the optimal energy-saving viscosityη oIf the viscosity is within the acceptable range in 85 percent, the acquired data are transmitted to the upper computer 38 for data storage, and the next round of monitoring is started; if the viscosity is less than 85% of the optimal energy-saving viscosity, the liquid level and the highest liquid level need to be judged if the viscosity is too lowh max2, according to the approximate linear relation between the viscosity and the concentration, generally supplementing the high-viscosity drag reduction liquid amount corresponding to the highest liquid level less than 20% to achieve the optimal energy-saving viscosity, sending an instruction to start the full-automatic drag reduction liquid preparation device 17 to the PLC control cabinet 37 after the liquid level is less than 80% of the highest liquid level, preparing the high-viscosity drag reduction liquid by adjusting the feeding frequency of the variable-frequency feeder 39, simultaneously starting the liquid supplementing pump 18, and monitoring the liquid level and the viscosity value in real time; when the liquid level is less than the highest liquid levelh maxAnd a viscosity equal toη oWhen the viscosity is regulated, the next round of monitoring is carried out; when the liquid level is less thanh maxBut has a viscosity of less thanη oWhen the liquid is needed, the liquid is continuously replenished; when the liquid level is equal toh maxAnd has a viscosity of less thanη oAnd stopping the preparation and liquid supplementing procedures to prevent overflow, entering the liquid level monitoring stage again, and preparing the high-viscosity resistance reducing liquid again to regulate and control the viscosity of the resistance reducing liquid in the inclined plate type water bath cooling tank 8 when the liquid level is reduced to 80% of the maximum liquid level.
As shown in fig. 3, the viscosity in the pump is constantly controlled by a pump set PLC monitoring substation, and the method specifically comprises the following steps:
setting an initial value of the water supply amount of the shaft seal and the opening degree of the electric regulating valve 28 according to an empirical formula of the liquid temperature and the water evaporation amount in the gas-liquid separator 2; viscosity in the gas-liquid separator 2 with 15min delay: if the viscosity is 0.85 or moreη oAnd is not more than 1.15η oTransmitting the acquired data to the upper computer 38 for data storage and starting the next monitoring;
if the viscosity is less than 0.85η o(or greater than 1.15)η o) When the viscosity is decreased (increased) due to a large (small) amount of shaft seal water supply, a command is sent to the PLC control cabinet 37 to control the opening degree of the electric control valve 28f kReducing (increasing) by 5%, delaying the viscosity in the gas-liquid separator 2 collected for 15min, and maintaining the measured viscosity at 0.85 for a long timeη oTo 1.15η oIn between, the optimal valve opening and the corresponding shaft seal water supply are found.
As shown in fig. 4, the pump set PLC monitors the substation to carry out interlocking control on the coal dust concentration and the coal slime height of the working solution in the inclined plate type water bath cooling box, and compares the coal dust concentration and the coal slime height with a parameter threshold value, and the method comprises the following specific steps:
if the concentration of the coal dust is lower than 1%, judging the height of the coal slurry in the next step: if the height of the coal slime is lower than 0.1m, transmitting the acquired data to an upper computer 38 for data storage and starting the next round of monitoring; if the height of the coal slime is more than or equal to 0.1m, the sewage pump 31 and the electric switch valve II32 are started, when the coal slime is discharged to the height of 0, the sewage pump 31 and the electric switch valve II32 are closed, the sludge discharge is stopped, and the next round of monitoring is started;
if the concentration of the pulverized coal is higher than 1%, the energy-saving effect of the resistance reducing liquid can be influenced, and the sewage pump 31 and the electric switch valve II32 need to be started until the liquid level in the inclined plate type water bath cooling tank 8 is reduced to the levelh minAnd stopping discharging, and supplementing fresh and clean drag reduction liquid by an intelligent drag reduction liquid and make the concentration of the pulverized coal reach an acceptable range through an intelligent drag reduction liquid and make-up integrated system.
Claims (6)
1. A control method for an energy-saving gas pump set combined transportation system under a complex gas extraction working condition is characterized in that the combined transportation system comprises a gas extraction pump set operation system, a working fluid circulating cooling system, a resistance-reducing working fluid distribution and compensation integrated system, an in-pump self-adaptive constant viscosity system, a working fluid intelligent purification system and a pump set PLC monitoring substation;
the gas extraction pump set operation system comprises a gas extraction pump set which is formed by at least two gas extraction pumps (1) in a combined transportation mode, wherein an air inlet regulating valve (6) and a gas comprehensive parameter tester (5) are sequentially installed on an air inlet pipeline (3) of each gas extraction pump (1), each gas extraction pump (1) is respectively connected with a gas-liquid separator (2), a top air outlet of the gas-liquid separator (2) is connected with an air outlet pipeline (4), and each gas extraction pump (1) is also respectively connected with a set of mine electrical parameter measuring instrument (7);
the working solution circulating cooling system comprises an inclined plate type water bath cooling box (8), a mining thick slurry pump (9), a low-position cold water pool (10), a secondary cooling device (11), a high-position filter pool (12) and a temperature sensor (16), wherein a bottom liquid discharge port of the gas-liquid separator (2) is connected with the inclined plate type water bath cooling box (8) through a liquid discharge pipeline (14), the inclined plate type water bath cooling box (8) is arranged in the low-position cold water pool (10), a liquid outlet of the inclined plate type water bath cooling box (8) is sequentially connected with the mining thick slurry pump (9), the secondary cooling device (11), the high-position filter pool (12), the temperature sensor (16) and a gas extraction pump set through a liquid inlet pipeline (13), and a liquid inlet end of the thick slurry pump (9) and a liquid outlet end of the high-position filter pool (12) are respectively provided with a manual regulating valve (15);
the drag reduction working solution preparation and supplement integrated system comprises a full-automatic drag reduction solution preparation device (17), a fluid infusion pump (18), a pipeline pump (19), an electric switch valve I (20), an electromagnetic flow meter I (21), a liquid level sensor I (22) and a viscosity sensor I (23), wherein a variable frequency feeder (39) is arranged at the top of the full-automatic drag reduction solution preparation device (17), a liquid level sensor II (40) is arranged in a preparation tank of the full-automatic drag reduction solution preparation device (17), the full-automatic drag reduction solution preparation device (17) is connected with the fluid infusion pump (18) and the inclined plate type water bath cooling tank (8) through a fluid infusion pipeline (24), the low-level cold water tank (10) is sequentially connected with the pipeline pump (19), the electric switch valve I (20), the electromagnetic flow meter I (21) and the full-automatic drag reduction solution preparation device (17) through a water inlet pipeline (25), the liquid level sensor I (22) and the viscosity sensor I (23) are both arranged in the inclined plate type water bath cooling tank (8);
the self-adaptive constant viscosity system in the pump comprises a water supply pump (26), an electric regulating valve (28), a viscosity sensor II (29) and an electromagnetic flowmeter II (30), wherein the electric regulating valve (28) and the electromagnetic flowmeter II (30) are the same as the gas extraction pump (1), the viscosity sensor II (29) is connected with the gas-liquid separator (2), and the low-level cold water tank (10) is sequentially connected with the water supply pump (26), the electric regulating valve (28), the electromagnetic flowmeter II (30) and the gas extraction pump set through a shaft seal water supply pipeline (27);
the intelligent working liquid purification system comprises a sewage pump (31), an electric switch valve II (32), a sludge storage tank (34), a sludge level meter (35) and a pulverized coal concentration sensor (36), wherein the sludge storage tank (34) is arranged at the bottom of the inclined plate type water bath cooling tank (8), the bottom of the sludge level meter (35) extends into the sludge storage tank (34), the pulverized coal concentration sensor (36) is arranged in the inclined plate type water bath cooling tank (8), and the sludge storage tank (34) is sequentially connected with the electric switch valve II (32) and the sewage pump (31) through a sewage discharge pipeline (33);
the pump unit PLC monitoring substation comprises a PLC control cabinet (37) and an upper computer (38), the gas comprehensive parameter tester (5), the mining electric parameter measuring instrument (7), the temperature sensor (16), the electromagnetic flowmeter I (21), the electromagnetic flowmeter II (30), the liquid level sensor I (22), the liquid level sensor II (40), the viscosity sensor I (23), the viscosity sensor II (29), the mud level meter (35) and the coal powder concentration sensor (36) are respectively in signal connection with the input end of a PLC control cabinet (37), the output end of the PLC control cabinet (37) is respectively in signal connection with the full-automatic drag reduction liquid preparation device (17), the variable-frequency feeder (39), the fluid infusion pump (18), the pipeline pump (19), the electric switch valve I (20), the electric control valve (28), the electric switch valve II (32) and the sewage pump (31), and the PLC control cabinet (37) is electrically connected with an upper computer (38);
the control method of the intermodal system comprises the following steps:
(1) the liquid level and the viscosity in the inclined plate type water bath cooling box (8) are controlled in an interlocking manner through a pump set PLC monitoring substation and are compared with a parameter threshold value;the specific implementation process is as follows: if the liquid level of the inclined plate type water bath cooling box (8) is less thanh min+0.3, sending an instruction to the PLC control cabinet (37) to start the full-automatic drag reduction liquid preparation device (17), monitoring the liquid level in the full-automatic drag reduction liquid preparation device (17), and when the liquid level in the preparation tank reaches the highest liquid levell maxWhen the resistance reducing liquid is prepared, stopping preparing the resistance reducing liquid; when the liquid level of the inclined plate type water bath cooling box (8) is less thanh minWhen the water level of the inclined plate type water bath cooling box (8) reaches the highest liquid level, a pipeline pump (19), an electric switch valve I (20), a full-automatic drag reduction liquid preparation device (17) and a liquid supplementing pump (18) are started until the liquid level reaches the highest liquid levelh maxStopping the resistance reducing liquid preparation and liquid supplementing procedures; if the liquid level of the inclined plate type water bath cooling tank is more than or equal toh min+0.3 and below the maximum levelh maxAnd judging the viscosity of the monitored working fluid: if the viscosity is greater than or equal to the optimal energy-saving viscosityη oIf the data is 85%, transmitting the acquired data to an upper computer for data storage and starting the next round of monitoring; if the viscosity is less than 85% of the optimal energy-saving viscosity, judging the liquid level and the highest liquid levelh maxWhen the liquid level is less than 80% of the highest liquid level, sending an instruction to a PLC control cabinet (37) to start a full-automatic drag reduction liquid preparation device (17) and a variable-frequency feeder (39) to prepare high-viscosity drag reduction liquid, simultaneously starting a liquid supplementing pump (18), and monitoring the liquid level and the viscosity value in real time; when the liquid level is less than the highest liquid levelh maxAnd a viscosity equal toη oWhen the viscosity regulation is finished, the next round of monitoring is carried out; when the liquid level is less thanh maxBut has a viscosity of less thanη oWhen the liquid is needed, the liquid is continuously replenished; when the liquid level is equal toh maxStopping the resistance reducing liquid preparation and liquid supplementing procedures, and entering the liquid level monitoring stage again;
(2) the viscosity in each gas extraction pump (1) is subjected to stable viscosity control through a pump set PLC monitoring substation; the specific implementation process is as follows: setting an initial value of the water supply amount of the shaft seal and the opening degree of an electric regulating valve (28) according to empirical formulas of the liquid temperature and the water evaporation amount in the gas-liquid separator (2); viscosity in the gas-liquid separator (2) with 15min delay: if the viscosity is 0.85 or moreη oAnd is not more than 1.15η oTransmitting the acquired data to an upper computer (38) for data storage and starting the next round of monitoring; if the viscosity is less than 0.85η oOr greater than 1.15η oThen, the opening degree of the electric control valve (28) is sent to a PLC control cabinet (37) to be instructedf kReducing or increasing by 5%, delaying the viscosity in the gas-liquid separator (2) for 15min, and maintaining the measured viscosity at 0.85η oTo 1.15η oIn the middle, the optimal valve opening and the corresponding shaft seal water supply amount are obtained;
(3) the pump set PLC monitors the substation to perform interlocking control on the coal dust concentration and the coal slime height of the working solution in the inclined plate type water bath cooling box (8), and compares the coal dust concentration and the coal slime height with a parameter threshold value; the specific implementation process is as follows: if the concentration of the coal dust is lower than 1%, judging the height of the coal slurry in the next step: if the height of the coal slime is lower than 0.1m, transmitting the acquired data to an upper computer (38) for data storage and starting the next round of monitoring; if the height of the coal slime is more than or equal to 0.1m, starting a sewage pump (31) and an electric switch valve II (32), when the coal slime is discharged to the height of 0, closing the sewage pump (31) and the electric switch valve II (32), stopping discharging the coal slime, and starting the next round of monitoring; if the concentration of the pulverized coal is higher than 1%, a sewage pump (31) and an electric switch valve II (32) are started until the liquid level of the inclined plate type water bath cooling tank (8) is reduced to the levelh minAnd stopping sewage discharge and starting the next monitoring.
2. The control method of the energy-saving gas pump group combined transportation system used under the complex gas extraction working condition according to claim 1, wherein the flow rates of the pipeline pump (19) and the liquid supplementing pump (18) are consistent.
3. The control method of the energy-saving gas extraction pump set combined transportation system used under the complex gas extraction working condition according to claim 1, wherein the number of the combined transportation pump sets of the gas extraction pump set is 2-20 gas extraction pumps (1).
4. The control method of the energy-saving gas pump group combined transportation system used under the complex gas extraction working condition according to claim 1, characterized in that partial inclined plates are installed at the upper part of the inclined plate type water bath cooling tank (8), the distance between the inclined plates is 50-150 mm, and the inclined angle of the inclined plates is 30-60 degrees.
5. The control method for the energy-saving gas pump set combined transportation system under the complex gas extraction working condition according to claim 1, wherein the number of the sludge storage tanks (34) is 2-5.
6. The control method of the energy-saving gas pump set combined transportation system used under the complex gas extraction working condition according to claim 1, wherein a filter screen is arranged at a liquid outlet of the high-position filter tank (12), and the mesh number of the filter screen is 100-140 meshes.
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