CN113653643A - Cost-benefit intelligent regulation and control method for adding damping fluid of water ring vacuum pump for mine - Google Patents

Cost-benefit intelligent regulation and control method for adding damping fluid of water ring vacuum pump for mine Download PDF

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CN113653643A
CN113653643A CN202110955611.1A CN202110955611A CN113653643A CN 113653643 A CN113653643 A CN 113653643A CN 202110955611 A CN202110955611 A CN 202110955611A CN 113653643 A CN113653643 A CN 113653643A
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liquid
electric
viscosity
needle valve
water ring
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CN113653643B (en
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张一帆
周福宝
李金石
张晨
刘春�
康建宏
张帝
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/28—Safety arrangements; Monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps

Abstract

The invention discloses a cost-benefit intelligent regulation and control method for adding a drag reducing liquid of a water ring vacuum pump for a mine, which is characterized in that according to the coupling relation between the liquid level change rate and the drag reducing agent degradation rate, a design scheme with controllable separation efficiency of a two-stage gas-liquid separator is assisted, scientific and accurate automatic regulation and control are carried out on the adding amount and adding concentration of the drag reducing liquid of the water ring vacuum pump, a viscosity-liquid level cooperative control method of the drag reducing liquid is created, the defects of a control mode with liquid level as a main mode and viscosity as an auxiliary mode in the prior art are overcome, the drag reducing liquid can be always positioned at the optimal viscosity and the highest liquid level, the problems of high adding cost and uncertain fluctuation of the viscosity of the current drag reducing liquid are solved, and the cost minimization of the drag reducing liquid and the maximization of energy saving benefit are realized.

Description

Cost-benefit intelligent regulation and control method for adding damping fluid of water ring vacuum pump for mine
Technical Field
The invention relates to the field of energy conservation and environmental protection, in particular to a cost-benefit intelligent regulation and control method for adding a drag reducing fluid of a water ring vacuum pump for a mine.
Background
The water ring vacuum pump is widely applied to a coal mine gas extraction system with high safety, but always faces the major engineering problems of high energy consumption and low efficiency. Therefore, a great deal of research is carried out on the energy-saving effect improving method for the mining water ring vacuum pump by engineering technicians in the field, the principle that the polymer drag reduction liquid reduces the useless power loss of the water ring vacuum pump is provided, a series of energy-saving systems suitable for the ground and underground pumping and extracting pump station working conditions are developed, the drag reduction liquid of the gas pump can be automatically added, the quantitative coupling relation among the loss amount of the drag reduction liquid, the molecular degradation amount of the drag reducer and the adding amount of the drag reducer is not considered, and the cost-benefit maximization of the technology under the complicated and varied conditions of the pumping and extracting working conditions, the external environment and the like cannot be realized.
The loss amount of the drag reduction liquid is closely related to the separation effect of a rear-stage gas-liquid separator of the water ring pump, and a gravity separator is adopted for gas-liquid separation on site, but the separation effect of the separator is poor, and a large amount of drag reduction liquid is discharged to the atmosphere or downstream power generation equipment through an exhaust pipeline, so that the site environment pollution or the downstream equipment damage is caused. CN103055609A discloses a flue gas desulfurization water ring vacuum pump outlet gas-liquid separation device, which realizes high-precision separation of gas and liquid by utilizing the gravity-inertia separation integrated principle, and the content of liquid drops at the outlet can be controlled at 75mg/m3Within the range. However, the device cannot quantitatively control the amount of loss of the drag reducer in consideration of the physicochemical reaction of the degradation of the drag reducer.
The dosage of the drag reducer is closely related to the loss of the drag reducing fluid and the molecular degradation degree thereof, because the degradation rate of the drag reducer is strongly influenced by the external environment (such as the shearing strength of a pump, the ambient temperature, the water quality and the like): under the working conditions of low pump rotating speed, good water quality and low external environment temperature (such as winter), the degradation rate is low; under the working conditions of high pump rotating speed, poor water quality and high environmental temperature (such as summer), the degradation rate is obviously accelerated. CN112354264A discloses that a method of 'liquid level is main and viscosity is auxiliary' is adopted to supplement high and low concentration drag reduction liquid, but the intermittent liquid supplement causes large fluctuation of the liquid level and the viscosity, the optimal viscosity and the highest liquid level can not be maintained constant for a long time, and further the economic benefit of the technology is reduced.
From the above, the dosage of the drag reducer is the sum of the drag reducing agent dosage corresponding to the drag reducing fluid loss and the molecular degradation of the drag reducer. However, it is generally believed that the smaller the drag reducing fluid loss, the lower the drag reducer dosing cost, and the higher the economic benefit of the technology, but this view ignores the effect of drag reducer molecular degradation on dosing. The application site finds that under the condition that the molecular degradation rate of the drag reducer is high in summer, if the loss of the drag reducer is too small, the amount of fresh supplemented drag reducer is small, and even if the concentrated solution is added, the optimal energy-saving viscosity cannot be achieved, so that the technical energy-saving effect is maximized by simply pursuing the lowest fluid consumption; meanwhile, if the liquid consumption is too large, the adding cost of the resistance reducing liquid is increased. In winter, the drag reducer molecules are less degraded, and the smaller the possible fluid consumption, the better. Therefore, the optimal matching relationship among the loss of the drag reducing fluid, the molecular degradation of the drag reducing agent and the dosage of the drag reducing agent is accurately regulated and controlled, so that the cost-benefit generated by the drag reducing fluid energy-saving technology can be maximized.
Disclosure of Invention
The invention aims to provide a cost-benefit intelligent regulation and control method for adding a drag reduction liquid of a water ring vacuum pump for a mine.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a cost-benefit intelligent regulation and control method for adding a drag reduction liquid of a water ring vacuum pump for a mine is characterized in that an adopted regulation and control system comprises a concentrated liquid storage tank, an optimal solution storage tank, a water ring vacuum pump, a first-stage gas-liquid separator, a second-stage gas-liquid separator and a circulating liquid pool, wherein a discharge port of the water ring vacuum pump is connected with an inlet of the first-stage gas-liquid separator, an air outlet of the first-stage gas-liquid separator is connected with a main pipe gas flowmeter and then divided into two branches, one branch is sequentially connected with a first electric switch valve, the second-stage gas-liquid separator and a second electric switch valve, the other branch is sequentially connected with an electric control valve and a bypass gas flowmeter, the electric control valve and the bypass gas flowmeter are in linkage control, and liquid discharge ports of the first-stage gas-liquid separator and the second-liquid separator are connected with the circulating liquid pool through liquid discharge pipes;
the concentrated solution storage tank is sequentially connected with a first pipeline pump, a first electromagnetic flow meter and a first electric needle valve, wherein the first electromagnetic flow meter and the first electric needle valve are controlled in an interlocking manner; the optimal solution storage tank is sequentially connected with a second pipeline pump, a second electromagnetic flow meter and a second electric needle valve, wherein the second electromagnetic flow meter and the second electric needle valve are controlled in an interlocking manner; the first electric needle valve and the second electric needle valve are connected with a circulating liquid pool through a liquid supplementing pipe; a submersible pump, a liquid level sensor and a viscosity sensor are arranged in the circulating liquid pool, the viscosity sensor is controlled by a time relay in a linkage manner, and the submersible pump is connected with a liquid inlet of the water ring vacuum pump through a liquid inlet pipe;
the regulation and control method comprises the following steps:
a. firstly, measuring the gas flow Q of the main exhaust pipeline and the optimal viscosity mu of the resistance reducing liquid of the circulating liquid poolopt；
b. The electric regulating valve is completely opened, the first electric switch valve and the second electric switch valve are completely closed, 1H is delayed, and the liquid level difference value delta H of the circulating liquid pool is calculatedmaxFurther obtaining the maximum liquid consumption rate delta Vmax；
c. Completely closing the electric regulating valve, completely opening the first electric switch valve and the second electric switch valve, delaying for 1H, and calculating the liquid level difference delta H of the circulating liquid poolminFurther obtaining the minimum liquid consumption rate delta Vmin；
d. Starting the first pipeline pump to start injecting and reducing the resistance liquid, and adjusting the first electric needle valve to the flow delta M of the first electromagnetic flowmeterminEqual to the minimum liquid consumption rate DeltaVmin；
e. Recording viscosity mu of drag reduction liquid in circulating liquid pooltAnd recording mu by using a time relayoptDecrease to mu95The time t is used for calculating the viscosity change rate epsilon (mu) of the drag reduction liquidopt-μ95) T, and obtaining the degradation rate v ═ beta (C) of the drag reducer molecules according to the linear relation between the viscosity and the concentration of the drag reduceropt-C95) T (in the formula,. mu.optAnd CoptRespectively the optimal viscosity and the corresponding concentration of the drag reduction fluid; mu.s95And C95Respectively 95% of the optimal viscosity value and the corresponding concentration at the moment; β is a coefficient);
f. calculating the required fluid replacement concentration C based on the drag reducer degradation rate and the minimum fluid consumption rateSupplement deviceNamely:
Figure BDA0003220373230000031
(wherein. alpha. -. beta./t, H)2hTo delay the level value of the circulating bath by 2 h),
and is compared with the concentration C of the concentrated solution in the concentrated solution storage tankmaxAnd (3) comparison:
(1) when C is presentSupplement device<CmaxTurning on the second pipeline pump, adjusting the second electric needle valve to the second electromagnetic flowmeter to display the flow as
Figure BDA0003220373230000032
Simultaneously adjusting the first electric needle valve to the first electromagnetic flowmeter to display the flow as
Figure BDA0003220373230000033
And has a value of Δ Vmin＝M1+M2；
(2) When C is presentSupplement device＝CmaxOpening the second pipeline pump, and adjusting the second electric needle valve to the flow M displayed by the second electromagnetic flowmeter2Equal to the minimum liquid consumption rate DeltaVminSimultaneously closing the first tubing pump and the first electrically operated needle valve;
(3) when C is presentSupplement device>CmaxOpening and adjusting the electric control valve to make the bypass gas flowmeter display flow
Figure BDA0003220373230000034
And turn on the secondA pipeline pump for adjusting the second electric needle valve to the flow M displayed by the second electromagnetic flowmeter2Is equal to Δ Vmin+kΔVmaxSimultaneously closing the first pipeline pump and the first electric needle valve;
g. resetting and clearing at intervals, and re-running the system program.
Preferably, the liquid discharge pipes of the first-stage gas-liquid separator and the second-stage gas-liquid separator are respectively provided with an automatic liquid discharge valve.
Preferably, the first stage gas-liquid separator is selected from a gravity type baffle separator, and the second stage gas-liquid separator is selected from one of a high-efficiency dynamic vane type separator and a double-layer S-type plate separator.
Preferably, in step g, the system is reset every 10d to 20 d.
Compared with the prior art, the invention has the following beneficial effects:
(1) the influence of gas extraction working conditions and external environment changes on the molecular degradation of the drag reducer is considered, the addition amount and the addition concentration of the drag reducer of the water ring vacuum pump are scientifically and accurately and automatically regulated and controlled by the design scheme that the separation efficiency of the two-stage gas-liquid separator is controllable according to the coupling relation between the liquid level change rate and the drag reducer degradation rate, the problems of high addition cost and uncertain fluctuation of viscosity of the drag reducer at present are solved, and the cost minimization and the energy-saving benefit maximization of the drag reducer are realized.
(2) Through the optimal proportion and real-time quantitative supplement of the concentrated solution and the optimal drag reduction solution, a viscosity-liquid level cooperative control method of the drag reduction solution is created, the defects of a control mode of mainly liquid level and secondarily viscosity in the prior art are overcome, the drag reduction solution can be always positioned at the optimal viscosity and the highest liquid level, the energy saving rate of an energy saving technology can be greatly improved, and the temperature of the pump drag reduction solution can be reduced, so that the gas extraction flow is improved.
Drawings
FIG. 1 is a schematic structural diagram of a cost-benefit intelligent regulation and control system for adding a resistance reducing liquid of a water ring vacuum pump according to the present invention.
FIG. 2 is a flow chart of cost-benefit intelligent control of the addition of the drag reducing fluid of the water ring vacuum pump of the present invention.
FIG. 3 is a diagram showing the relationship between the liquid level and time of a circulating liquid pool of a gas pump station in Shaanxi.
Figure 4 is a graph of drag reducing fluid concentration versus viscosity.
Wherein: 1. the system comprises a concentrated solution storage tank, 2, a first pipeline pump, 3, a first flowmeter, 4, a first electric needle valve, 5, an optimal solution storage tank, 6, a second pipeline pump, 7, a second flowmeter, 8, a second electric needle valve, 9, a water ring vacuum pump, 10, a first-stage gas-liquid separator, 11, a main pipe gas flowmeter, 12, a first electric switch valve, 13, a second-stage gas-liquid separator, 14, a second electric switch valve, 15, an electric regulating valve, 16, a bypass gas flowmeter, 17, an automatic liquid discharge valve, 18, a liquid discharge pipe, 19, a circulating liquid pool, 20, a viscosity sensor, 21, a time relay, 22, a submersible pump, 23, a liquid level sensor, 24, a liquid supplementing pipe, 25 and a liquid inlet pipe.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1, the present invention firstly provides a cost-benefit intelligent control system for adding a resistance reducing liquid of a water ring vacuum pump, which comprises a concentrated liquid storage tank 1, an optimal solution storage tank 5, a water ring vacuum pump 9, a first stage gas-liquid separator 10, a second stage gas-liquid separator 13 and a circulating liquid pool 19;
the discharge port of the water ring vacuum pump 9 is connected with the inlet of the first-stage gas-liquid separator 10, the gas outlet of the first-stage gas-liquid separator 10 is connected with the main pipe gas flowmeter 11 and then divided into two branches, one branch is connected with the first electric switch valve 12, the second-stage gas-liquid separator 13 and the second electric switch valve 14 in sequence, the other branch is connected with the electric control valve 15 and the bypass gas flowmeter 16 in sequence, and the electric control valve 15 and the bypass gas flowmeter 16 are in linkage control. The first-stage gas-liquid separator 10 is a gravity type baffle separator and is used for primary coarse separation of large droplets (the particle size is larger than 100 mu m) in a slug flow type, a large number of small droplets are not separated at the moment, so that the liquid consumption is extremely large (the liquid consumption per pump is 10-30 t/d), the small droplets (8-100 mu m) are finely separated through the second-stage gas-liquid separator 13, the type of the separator is one of a high-efficiency dynamic vane type separator and a double-layer S-type plate separator, and the liquid consumption can be greatly reduced (about 0.05-0.15 t/d). In addition, the regulation and control system can give the electric control valve 15 a regulating signal according to a liquid supplementing concentration calculation model embedded in a program until the flow of the bypass gas flowmeter 16 displays the corresponding gas flow.
The concentrated solution storage tank 1 is sequentially connected with a first pipeline pump 2, a first electromagnetic flow meter 3 and a first electric needle valve 4, wherein the first electromagnetic flow meter 3 and the first electric needle valve 4 are controlled in an interlocking manner; and the optimal solution storage tank 5 is sequentially connected with a second pipeline pump 6, a second electromagnetic flow meter 7 and a second electric needle valve 8, wherein the second electromagnetic flow meter 7 and the second electric needle valve 8 are controlled in an interlocking manner. The regulation and control system can respectively regulate the two-way flow ratio to the required fluid replacement flow and fluid replacement concentration according to a fluid consumption rate model, a fluid replacement concentration calculation model and a drag reduction fluid concentration-viscosity relation model embedded in a program. The concentration of the concentrated solution in the concentrated solution storage tank is CmaxThe concentration is the maximum concentration capable of being naturally dissolved, and the higher the concentration is, the required fluid replacement concentration can be achieved through a smaller fluid consumption amount under the condition of obvious degradation rate. The concentration C corresponding to the solution concentration in the optimal solution storage tank when the energy-saving effect is most remarkableopt。
The liquid discharging ports of the first-stage gas-liquid separator 10 and the second-stage gas-liquid separator 13 are respectively connected with a circulating liquid pool 19 through a liquid discharging pipe 18, and in order to better realize automatic control, automatic liquid discharging valves 17 are respectively arranged on the liquid discharging pipes 18 of the first-stage gas-liquid separator 10 and the second-stage gas-liquid separator 13;
the first electric needle valve 4 and the second electric needle valve 8 are connected with a circulating liquid pool 19 through a liquid supplementing pipe 24; a submersible pump 22, a liquid level sensor 23 and a viscosity sensor 20 are arranged in the circulating liquid pool 19, the viscosity sensor 20 and a time relay 21 are controlled in an interlocking way, and mu is recordedoptDecrease to mu95(μ95Is equal to muopt95%) of the time t required. The submersible pump 22 is connected with the liquid inlet of the water ring vacuum pump 9 through a liquid inlet pipe 25.
The invention also provides a cost-benefit intelligent accurate regulation and control method for adding the drag reducing fluid of the water ring vacuum pump based on the regulation and control system, as shown in figure 2, which comprises the following steps:
(1) firstly, measuring the gas flow Q of the main exhaust pipeline and the optimal viscosity mu of the circulating liquid poolopt；
(2) The electric control valve 15 is fully opened, the first electric switch valve 12 and the second electric switch valve 14 are fully closed, so that the gas is discharged only through the first-stage gas-liquid separator 10, and the liquid consumption is maximum at the moment; recording and calculating the liquid level difference delta H of the circulating liquid pool 19 after delaying for 1HmaxAccording to the direct proportion relation between the liquid consumption rate and the time (figure 3), the maximum liquid consumption rate delta V is further obtainedmax＝S·ΔHmax(S is the bottom area of the circulating liquid pool);
(3) the electric control valve 15 is completely closed, the first electric switch valve 12 and the second electric switch valve 14 are completely opened, so that the gas is discharged through the first-stage gas-liquid separator 10 and the second-stage gas-liquid separator 13, and the liquid consumption is minimum; recording and calculating the liquid level difference delta H of the circulating liquid pool 19 after delaying for 1HminFurther obtaining the minimum liquid consumption rate delta Vmin＝S·ΔHmin；
(4) The first pipeline pump 2 is started to start injecting and reducing the resistance liquid, and the first electric needle valve 4 is adjusted to the flow M measured by the first flow meter 31Equal to the minimum liquid consumption rate DeltaVminThe liquid replenishing rate and the liquid consuming rate are equal to maintain the liquid level as H2hThe position avoids overlarge fluctuation of the liquid level, is beneficial to increasing the liquid retaining amount and the cooling time of the circulating liquid pool 19, and reduces the temperature of the pump drag reduction liquid so as to improve the gas extraction flow;
(5) recording the viscosity mu of the drag reduction fluid in the circulating fluid pool 19tAnd recording mu using a time relay 21optDecrease to mu95The required time t is calculated according to a first-order kinetic model of polymer degradation reaction, and the viscosity change rate epsilon of the drag reduction liquid is (mu)opt-μ95) And (C) obtaining the degradation rate v ═ beta (C) of the drag reducer molecules according to the linear relationship between viscosity and concentration of drag reducer (fig. 4)opt-C95) T (in the formula,. mu.optAnd CoptRespectively the optimal viscosity and the corresponding concentration of the drag reduction fluid; mu.s95And C95Respectively of optimum viscosity value95% and the concentration corresponding thereto; let α be β/t, where β is 0.0201 from fig. 4);
(6) calculating the required fluid replacement concentration C based on the drag reducer degradation rate and the minimum fluid consumption rateSupplement deviceNamely:
Figure BDA0003220373230000061
(in the formula, H2hThe level value of the circulating liquid pool after 2 hours delay) and is compared with the concentration C of the concentrated liquid in the concentrated liquid storage tank 1maxAnd (3) comparison:
a. when C is presentSupplement device<CmaxNamely, under the condition of keeping the minimum liquid consumption, the concentration of the mixed solution is C through the flow ratio of the concentrated solution storage tank 1 and the optimal solution storage tank 5Supplement deviceThe specific control steps are that the second pipeline pump 6 is started, the second electric needle valve 8 is adjusted to the second flow meter 7 to display the flow M1Is composed of
Figure BDA0003220373230000062
Simultaneously adjusting the first electric needle valve 4 to the first flowmeter 3 to display the flow M2Is composed of
Figure BDA0003220373230000063
b. When C is presentSupplement device＝CmaxNamely, under the condition of keeping the minimum liquid consumption, the solution is supplemented only by the concentrated solution storage tank 1 and the optimal solution cannot be blended, and the specific control steps are that the second pipeline pump 6 is started, the second electric needle valve 8 is adjusted to the second flow meter 7 to display the flow M2Is equal to Δ VminSimultaneously closing the first pipeline pump 2 and the first electric needle valve 4;
c. when C is presentSupplement device>CmaxI.e., faster degradation rate (which occurs at high exposure to heat in summer, poor water quality, and high shear rate of the pump to the drag-reducing agent molecules), C is not achieved by replenishing the concentrate at minimum fluid consumptionSupplement deviceConcentration, in which case the amount of make-up fluid of the concentrate can only be increased by adjusting (increasing) the amount of fluid consumptionSupplement device＝Cmax. The liquid consumption is increased by opening the electrically-operated control valve 15 to a predetermined opening degree to partially carry the liquid dropletsThe gas is directly discharged through the bypass, the liquid carrying amount of the gas is related to the bypass gas amount, and the gas can be calculated through the ratio of the maximum liquid consumption rate to the main pipe gas amount. The specific control steps are that the electric regulating valve 15 is opened and regulated to ensure that the flow Q of the bypass gas flowmeter 161Is shown as
Figure BDA0003220373230000071
And the second pipeline pump 6 is started, and the second electric needle valve 8 is adjusted to the second flow meter 7 to display the flow M2Is equal to (Δ V)min+kΔVmax) While the first pipe pump 2 and the first electric needle valve 4 are closed.
(7) And resetting and clearing every 10-20 days, and re-running the system program to adapt to the changes of different extraction working conditions and external environments.

Claims (4)

1. A cost-benefit intelligent regulation and control method for adding a drag reduction liquid of a mining water ring vacuum pump is characterized in that an adopted regulation and control system comprises a concentrated liquid storage tank (1), an optimal solution storage tank (5), a water ring vacuum pump (9), a first-stage gas-liquid separator (10), a second-stage gas-liquid separator (13) and a circulating liquid pool (19), a discharge port of the water ring vacuum pump (9) is connected with an inlet of the first-stage gas-liquid separator (10), an air outlet of the first-stage gas-liquid separator (10) is connected with a main pipe gas flow meter (11) and then divided into two branches, one branch is sequentially connected with a first electric switch valve (12), the second-stage gas-liquid separator (13) and a second electric switch valve (14), the other branch is sequentially connected with an electric control valve (15) and a bypass gas flow meter (16), and the electric control valve (15) and the bypass gas flow meter (16) are in linkage control, liquid discharge ports of the first-stage gas-liquid separator (10) and the second-stage gas-liquid separator (13) are respectively connected with the circulating liquid pool (19) through a liquid discharge pipe (18);
the concentrated solution storage tank (1) is sequentially connected with a first pipeline pump (2), a first electromagnetic flow meter (3) and a first electric needle valve (4), wherein the first electromagnetic flow meter (3) and the first electric needle valve (4) are controlled in an interlocking mode; the optimal solution storage tank (5) is sequentially connected with a second pipeline pump (6), a second electromagnetic flow meter (7) and a second electric needle valve (8), wherein the second electromagnetic flow meter (7) and the second electric needle valve (8) are controlled in an interlocking manner; the first electric needle valve (4) and the second electric needle valve (8) are connected with the circulating liquid pool (19) through a liquid supplementing pipe (24); a submersible pump (22), a liquid level sensor (23) and a viscosity sensor (20) are arranged in the circulating liquid pool (19), the viscosity sensor (20) is controlled by a time relay (21) in a linkage manner, and the submersible pump (22) is connected with a liquid inlet of a water ring vacuum pump (9) through a liquid inlet pipe (25);
the regulation and control method comprises the following steps:
a. firstly, measuring the gas flow Q of the main exhaust pipeline and the optimal viscosity mu of the resistance reducing liquid of the circulating liquid poolopt；
b. The electric regulating valve (15) is fully opened, the first electric switch valve (12) and the second electric switch valve (14) are fully closed, 1H is delayed, and the liquid level difference value delta H of the circulating liquid pool (19) is calculatedmaxFurther obtaining the maximum liquid consumption rate delta Vmax＝S·ΔHmaxWherein S is the bottom area of the circulating liquid pool (19);
c. the electric regulating valve (15) is completely closed, the first electric switch valve (12) and the second electric switch valve (14) are completely opened, 1H is delayed, and the liquid level difference delta H of the circulating liquid pool (19) is calculatedminFurther obtaining the minimum liquid consumption rate delta Vmin＝S·ΔHmin；
d. Starting the first pipeline pump (2) to start injecting and reducing the resistance liquid, and adjusting the first electric needle valve (4) to the flow M measured by the first electromagnetic flow meter (3)1Equal to the minimum liquid consumption rate DeltaVmin；
e. Recording the viscosity mu of the drag reduction liquid in the circulating liquid pool (19)tAnd recording mu with a time relay (21)optDecrease to mu95The time t is used for calculating the viscosity change rate epsilon (mu) of the drag reduction liquidopt-μ95) T, and obtaining the degradation rate v ═ beta (C) of the drag reducer molecules according to the linear relation between the viscosity and the concentration of the drag reduceropt-C95) T, where μoptAnd CoptRespectively the optimal viscosity and the corresponding concentration of the drag reduction fluid; mu.s95And C95Respectively 95% of the optimal viscosity value and the corresponding concentration at the moment; beta is a coefficient;
f. calculating a required replenishment based on the drag reducer degradation rate and the minimum fluid consumption rateLiquid concentration CSupplement deviceNamely:
Figure FDA0003220373220000021
wherein α ═ β/t, H2hIn order to delay the level value of the circulating liquid pool after 2h,
and is compared with the concentration C of the concentrated solution in the concentrated solution storage tank (1)maxAnd (3) comparison:
(1) when C is presentSupplement device<CmaxThe second pipeline pump (6) is started, and the second electric needle valve (8) is adjusted to the flow rate displayed by the second electromagnetic flow meter (7)
Figure FDA0003220373220000022
Simultaneously adjusting the first electric needle valve (4) to the flow rate displayed by the first electromagnetic flowmeter (3)
Figure FDA0003220373220000023
And has a value of Δ Vmin＝M1+M2；
(2) When C is presentSupplement device＝CmaxThe second pipeline pump (6) is started, and the second electric needle valve (8) is adjusted to the flow M displayed by the second electromagnetic flow meter (7)2Equal to the minimum liquid consumption rate DeltaVminSimultaneously closing the first tubing pump (2) and the first electrically operated needle valve (4);
(3) when C is presentSupplement device>CmaxOpening and adjusting the electric control valve (15) to make the bypass gas flowmeter (16) display the flow
Figure FDA0003220373220000024
And the second pipeline pump (6) is started, and the second electric needle valve (8) is adjusted to the flow M displayed by the second electromagnetic flow meter (7)2＝ΔVmin+kΔVmaxSimultaneously closing the first pipeline pump (2) and the first electric needle valve (4);
g. resetting and clearing at intervals, and re-running the system program.
2. The method for intelligently regulating and controlling the cost and the benefit of adding the drag reducing fluid of the water ring vacuum pump for the mine according to claim 1, wherein automatic drain valves (17) are respectively arranged on drain pipes (18) of the first-stage gas-liquid separator (10) and the second-stage gas-liquid separator (13).
3. The method for intelligently regulating and controlling the cost and the benefit of adding the drag reducing fluid of the water ring vacuum pump for the mine according to claim 1, wherein the first-stage gas-liquid separator (10) is selected from a gravity baffle separator, and the second-stage gas-liquid separator (13) is selected from one of a high-efficiency dynamic blade separator and a double-layer S-shaped plate separator.
4. The method for intelligently regulating and controlling the cost-benefit of adding the drag reducing fluid of the water ring vacuum pump for mines according to claim 1, wherein in the step g, system resetting is carried out every 10d to 20 d.
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CN109372574A (en) * 2018-12-26 2019-02-22 山东理工大学 Water ring vacuum pump and extraction main line control method in a kind of gas discharge in mine
CN208831237U (en) * 2018-08-16 2019-05-07 山东安益矿用设备有限公司 A kind of intelligence coal mine gas drainage pumping plant

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Publication number Priority date Publication date Assignee Title
CN107152399A (en) * 2017-05-31 2017-09-12 中国矿业大学 A kind of method that use polymer drag reducing agent improves gas drainage under suction liquid-ring vacuum pump
CN107152400A (en) * 2017-07-10 2017-09-12 中国矿业大学 A kind of closed circulation system for improving gas drainage under suction the way
CN108661696A (en) * 2018-05-14 2018-10-16 中国矿业大学 A kind of totally-enclosed gas pumping pump energy conserving system based on drag reduction working solution
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