Steel pipe quenching cooling water circulation system and control method thereof

Abstract

The invention discloses a steel pipe quenching cooling water circulation system and a control method thereof. The steel pipe quenching cooling water circulation system comprises a water purification tank, an inner water spraying tank, inner spraying quenching equipment, outer spraying quenching equipment, an outer spraying water collecting tank and a control unit. The water purifying tank is communicated with the inner fountain tank through a water purifying pipeline, and a water replenishing regulating valve is arranged on the water purifying pipeline; the inner spraying quenching equipment is communicated with the inner spraying pool through an inner spraying pipeline, and an inner spraying quenching three-way valve is arranged on the inner spraying pipeline; the external spraying quenching equipment is communicated with the external spraying water collecting tank through a pipeline, the external spraying water collecting tank is communicated with the internal spraying pool through an external spraying water pipeline, and an external spraying water recovery regulating valve is arranged on the external spraying water pipeline; and the control unit is used for controlling the opening degrees of the water replenishing regulating valve, the inner spraying quenching three-way valve and the outer spraying water recycling regulating valve. According to the invention, equipment and site investment of the water treatment system can be reduced, and energy and water resource consumption can be saved.

Description

Technical Field

[0001] The invention relates to a cooling water circulation technology in the production of seamless steel pipes, and more specifically to a steel pipe quenching cooling water circulation system and a control method thereof. Background Art

[0002] The current seamless steel pipe quenching production process is widely used for heat treatment by internal spraying and external showering. However, in the interval between the quenching operations of two steel pipes on the current heat treatment production line, the turbid circulating water continuously supplied by the water treatment enters the iron groove without any use, and then returns to the turbid circulating system, resulting in a large waste of water resources. There is also the problem of insufficient water supply in some pipe materials (especially thick-walled pipes), forcing the production rhythm to slow down. At the same time, the pneumatic switch valve set on the internal spray main pipe has a certain impact on the water volume and pressure of the internal spray system when switching between opening and closing.

[0003] In existing patent applications, such as Chinese patent CN 103667606 A, an energy-saving heat treatment circulating water system is disclosed, including a cooling tower, a water reservoir, a centrifugal pump, a vacuum quenching furnace, a pit quenching furnace, a nitriding furnace and a self-priming pump. The cooling water inlet of the pit quenching furnace and the cooling water inlet of the nitriding furnace are each connected to the outlet of the corresponding self-priming pump, and the inlets of multiple self-priming pumps are connected to the outlet of the centrifugal pump. The cooling water circulation branches of each high-temperature furnace are changed from the traditional series total circulation to the parallel sub-circulation, and the operating state of the circulating water branch can be changed in time to achieve the purpose of energy saving. However, water recovery during intermittent work and automatic control system are not realized.

[0004] For example, Chinese patent CN 209974826 U discloses a stainless steel quenching water circulation device, including a quenching cooling pool, a first water pipe is fixedly connected to the top of the left side of the quenching cooling pool, one end of the first water pipe extends to the left and is fixedly connected to a cooling box, a water inlet pipe is fixedly connected to the frame of the top of the quenching cooling pool, the water inlet pipe is connected to the main water supply system of the device, a water valve is provided on the right side of the water inlet pipe body, and a water outlet pipe is horizontally connected to the bottom of the right side of the quenching cooling pool; when in use, the falling iron filings and dirt can be effectively diverted through the action of the pumping plate, so that the iron filings or dirt can better enter the three collection boxes. However, there is no systematic adjustment of the water volume. Summary of the invention

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a steel pipe quenching cooling water circulation system and a control method thereof, which can reduce the investment in water treatment system equipment and site, and save energy and water resource consumption.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a steel pipe quenching cooling water circulation system, comprising a clean water tank, an internal spraying tank, an internal spraying quenching device, an external spraying quenching device, an external spraying water collection tank and a control unit;

[0008] The clean water pool is connected to the inner fountain pool through a clean water pipeline, and a water supply regulating valve is provided on the clean water pipeline;

[0009] The internal spray quenching equipment is connected to the internal spray pool through an internal spray pipe, and the internal spray pipe is provided with an internal spray quenching three-way valve;

[0010] The external shower quenching equipment is connected to the external shower water collecting tank through a pipeline, and the external shower water collecting tank is connected to the internal fountain pool through an external shower water pipeline, and an external shower water recovery regulating valve is provided on the external shower water pipeline;

[0011] The control unit is used to control the opening of the water replenishment regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve.

[0012] Preferably, the external shower water collection tank is also connected to the ditch.

[0013] Preferably, a liquid level meter is provided in the inner fountain;

[0014] The liquid level value measured by the liquid level meter is transmitted to the control unit.

[0015] The second aspect of the present invention provides a control method based on the steel pipe quenching cooling water circulation system:

[0016] According to the liquid level value measured by the liquid level meter, the opening of the water supply regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve is executed in manual mode, gear automatic control mode, or stepless automatic control mode.

[0017] Preferably, the manual mode is as follows:

[0018] The operator manually operates the opening of the water replenishment regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve according to the liquid level value measured by the liquid level meter and other process requirements.

[0019] Preferably, in the gear automatic control mode, the external shower water recovery regulating valve is automatically opened to the set value on the HMI:

[0020] When P x <P low When the external shower water recovery regulating valve is set to a large opening setting value;

[0021] When P x >P highWhen the external shower water recovery regulating valve is set to a small opening setting value;

[0022] When P high <P x <P low When the external shower water recovery regulating valve is set to a normal opening setting value;

[0023] Where P x Indicates the liquid level value measured by the liquid level gauge, P low Indicates the low liquid level of the inner fountain, P high Indicates the high liquid level of the inner fountain.

[0024] The maximum opening setting value is the fully open state of the valve;

[0025] The small opening setting value is 1 / 3 of the fully open state of the valve;

[0026] The normal opening setting value is 2 / 3 of the fully open state of the valve.

[0027] Preferably, in the gear automatic control mode, when the liquid level of the inner fountain is lower than P low When the water supply regulating valve is automatically opened to the set value on the HMI:

[0028] When P x <P low When the water supply regulating valve is set to a small opening setting value;

[0029] When P x <P min When the water supply regulating valve is set to a large opening setting value;

[0030] When P x >P high When , the water supply regulating valve is closed;

[0031] Where P min Indicates the lowest limit of the inner fountain, P max Indicates the upper limit of the inner fountain.

[0032] Preferably, in the gear automatic control mode, when the internal spray quenching equipment is in an intermittent working state, the internal spray quenching three-way valve is opened to allow the water sprayed by the internal spray quenching equipment to be recovered to the internal spray pool;

[0033] When the external shower quenching equipment is in an intermittent working state, the external shower baffle recovers the external shower water of the external shower quenching equipment to the external shower water collecting tank, and the external shower water recovery regulating valve is opened to supply the external shower water of the external shower water collecting tank to the internal fountain pool.

[0034] Preferably, the stepless automatic control mode is:

[0035] The liquid level height is set in the inner fountain pool, and the difference between the actual liquid level value in the inner fountain pool measured by the liquid level meter and the set liquid level height is used to set the opening of the water replenishment regulating valve, the inner spray quenching three-way valve, and the external shower water recovery regulating valve.

[0036] Preferably, in the stepless automatic control mode, the opening settings of the water supply regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve are calculated using the following formula:

[0037]

[0038] In the formula, K0 represents the adjustment coefficient of the internal spray quenching three-way valve, which takes the value of 0 or 1;

[0039] K1 represents the adjustment coefficient of the external sprinkler water recovery regulating valve, and its value is between 0 and 1;

[0040] K2 represents the adjustment coefficient of the water supply regulating valve, and its value is between 0 and 1;

[0041] Q 内 Indicates the process setting flow rate of the internal spray quenching equipment;

[0042] Q 外 Indicates the process setting flow rate of the external shower quenching equipment;

[0043] Q 补 Indicates the process set flow rate of the water supply regulating valve;

[0044] t 工作 Indicates the quenching working time of the steel pipe;

[0045] t 间歇 Indicates the quenching interval time of the steel pipe;

[0046] When P x ≥P max When , K0=K1=K2=0;

[0047] When P x ≤P min When K0=K1=K2=1, if the flow rate is still not satisfied, increase t 间歇 time;

[0048] When P low ≥P x ≥P min When K0=1, K1=1,

[0049] When P max ≥P x ≥P highWhen , K0=1, K2=0, and K1 is calculated by formula (1);

[0050] When P high ≥P x ≥P low When , K0=1, set the initial value of K2 to 0, and K1 is calculated by formula (1). If the calculated value of K1 is greater than 1, K1 is set to 1. At this time, the recalculated value of K2 is:

[0051]

[0052] A steel pipe quenching cooling water circulation system and a control method thereof provided by the present invention can reduce the investment in water treatment system equipment and site, save energy and water resource consumption, optimize the water balance system of the internal fountain pool, add an automatic control component to the water supply source of the water pool, and realize closed-loop control of the liquid level according to the water pool liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a schematic diagram of the structural framework of the steel pipe quenching cooling water circulation system of the present invention;

[0054] Figure 2 It is a schematic diagram of the control method principle of the steel pipe quenching cooling water circulation system of the present invention;

[0055] Figure 3 It is a schematic diagram of the liquid level in the inner fountain in the steel pipe quenching cooling water circulation system of the present invention. DETAILED DESCRIPTION

[0056] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0057] Combination Figure 1 As shown, a steel pipe quenching cooling water circulation system provided by the present invention includes a clean water pool 1, an internal spraying pool 2, an internal spraying quenching device 3, an external showering quenching device 4, an external showering water collecting tank 5 and a control unit.

[0058] The clean water pool 1 is connected with the inner fountain pool 2 through a clean water pipeline, and a water supply regulating valve 6 is provided on the clean water pipeline.

[0059] The internal spray quenching equipment 3 is connected to the internal spray pool 2 through an internal spray pipe, and an internal spray quenching three-way valve 7 is provided on the internal spray pipe.

[0060] The external shower quenching equipment 4 is connected to the external shower water collecting tank 5 through a pipeline, and the external shower water collecting tank 5 is connected to the internal fountain pool 2 through an external shower water pipeline. An external shower water recovery regulating valve 8 is provided on the external shower water pipeline.

[0061] The control unit is used to control the opening of the water supply regulating valve 6, the internal spray quenching three-way valve 7, and the external spray water recovery regulating valve 8.

[0062] The external shower water collecting tank 5 is also connected to the ditch 9.

[0063] A liquid level meter is provided in the inner fountain 2.

[0064] The liquid level value in the inner fountain 2 measured by the liquid level meter is transmitted to the control unit in real time.

[0065] Combination Figure 2 and Figure 3 As shown, the present invention also provides a control method for the steel pipe quenching cooling water circulation system based on the present invention:

[0066] According to the liquid level value in the internal fountain pool 2 measured by the liquid level meter, the opening of the water supply regulating valve 6, the internal spray quenching three-way valve 7, and the external shower water recovery regulating valve 8 is executed in manual mode, gear automatic control mode or stepless automatic control mode to achieve optimal water scheduling and use.

[0067] Manual mode is as follows:

[0068] The operator manually controls the opening of the water replenishment regulating valve 6, the internal spray quenching three-way valve 7, and the external shower water recovery regulating valve 8 according to the liquid level value in the internal spray pool 2 measured by the liquid level meter and other process requirements.

[0069] In the gear automatic control mode, the opening of the corresponding valve is set according to the water demand of the external shower quenching equipment 4 and the internal spray quenching equipment 3 for different quenching processes, and the external shower water recovery regulating valve 8 is automatically opened to the set value on the HMI:

[0070] When P x <P low When the external shower water recovery regulating valve 8 is set to a large opening setting value, that is, the valve is fully open;

[0071] When P x >P high When the external water recovery regulating valve 8 is set to a small opening setting value, that is, the valve is 1 / 3 of the fully open state;

[0072] When P high <P x <P low When the external water recovery regulating valve 8 is set to the normal opening setting value, that is, the 2 / 3 state of the valve being fully open;

[0073] Where P x Indicates the liquid level value measured by the liquid level gauge, P low Indicates the low liquid level of the inner fountain 2, P high Indicates the high liquid level of the inner fountain 2.

[0074] In the gear automatic control mode, when the liquid level of the inner fountain 2 is lower than P low When the water supply regulating valve 6 is automatically opened to the set value on the HMI:

[0075] When P x <P low When the water supply regulating valve 6 is set to a small opening setting value, that is, the valve is 1 / 3 of the fully open state;

[0076] When P x <P min When the water supply regulating valve 6 is set to the maximum opening setting value, that is, the valve is fully open; if the flow rate is still not satisfied, increase the production interval time, that is, reduce the production rhythm;

[0077] When P x >P high When , the water supply regulating valve 6 is closed;

[0078] Where P min Indicates the lowest limit of the inner fountain 2, P max Indicates the upper limit of the inner fountain 2.

[0079] In the gear automatic control mode, when the internal spray quenching device 3 is in the intermittent working state, the internal spray quenching three-way valve 7 is opened, so that the water sprayed by the internal spray quenching device 7 is recovered to the internal spray pool 2. When the external spray quenching device 4 is in the intermittent working state, the external spray baffle recovers the external spray water of the external spray quenching device 4 to the external spray water collection tank 5, and the external spray water recovery regulating valve 8 is opened, so that the external spray water of the external spray water collection tank 5 is supplied to the internal spray pool 2. In this way, the purpose of saving water is achieved, and the pressure and energy consumption of sewage treatment are reduced.

[0080] The stepless automatic control mode is:

[0081] The liquid level height is set in the inner fountain pool 2, and the difference between the actual liquid level value in the inner fountain pool 2 and the set liquid level height measured by the liquid level meter is used to set the opening of the water replenishment regulating valve 6, the inner spray quenching three-way valve, and the outer sprinkler water recovery regulating valve 8.

[0082] In the stepless automatic control mode, the opening settings of the water supply regulating valve 6, the internal spray quenching three-way valve, and the external spray water recovery regulating valve 8 are calculated using the following formula:

[0083]

[0084] Wherein, K0 represents the adjustment coefficient of the internal spray quenching three-way valve 7, which takes a value of 0 or 1;

[0085] K1 represents the adjustment coefficient of the external shower water recovery regulating valve 8, and its value is between 0 and 1;

[0086] K2 represents the adjustment coefficient of the water supply regulating valve 6, and its value is between 0 and 1;

[0087] Q 内 Indicates the process setting flow rate of the internal spray quenching equipment 3;

[0088] Q 外 Indicates the process setting flow rate of the external shower quenching equipment 4;

[0089] Q 补 Indicates the process set flow rate of the water supply regulating valve 6;

[0090] t 工作 Indicates the quenching working time of the steel pipe;

[0091] t 间歇 Indicates the quenching interval time of the steel pipe;

[0092] (1) When P x ≥P max At this time, the liquid level of the inner fountain 2 is higher than the upper limit. In order to prevent the inner fountain 2 from overflowing, all valves leading to the inner fountain 2 are closed, then K0 = K1 = K2 = 0;

[0093] (2) When P x ≤P min At this time, the liquid level of the inner fountain 2 is lower than the minimum limit. All valve flows need to be opened to the maximum to ensure that the water volume of the inner fountain 2 is sufficient. Then K0 = K1 = K2 = 1. If the flow rate is still not satisfied, increase t 间歇 Time, that is, reducing the production rhythm, by reducing the rhythm to ensure that the water volume in the inner fountain 2 is sufficient;

[0094] (3) When P low ≥P x ≥P min At this time, the liquid level of the inner fountain pool 2 is higher than the minimum limit and lower than the low liquid level, and the inner spray quenching three-way valve 7 needs to be opened, then K0 = 1; in order to replenish the water volume of the inner fountain pool, the flow rate of the external shower water recovery regulating valve 8 is set to the maximum, then K1 = 1; in order to reduce the influence of the water supply regulating valve 6 on the water supply flow of the external shower quenching equipment 4, then

[0095] (4) When P max ≥P x ≥P high At this time, the liquid level of the internal fountain pool 2 is higher than the high liquid level and lower than the upper limit, and the water volume is sufficient, so the internal spray quenching three-way valve 7 is opened, then K0 = 1; the water supply regulating valve 6 is closed, then K2 = 0; K1 is calculated by formula (1);

[0096] (5) When P high ≥P x ≥Plow When the liquid level of the inner water fountain 2 is higher than the low level and lower than the high level, the liquid level is moderate. At this time, open the inner spray quenching three-way valve 7, then K0 = 1; in order to avoid affecting the flow of the outer spray quenching equipment 4, set the initial value of K2 to 0; K1 is calculated by formula (1). If the calculated value of K1 is greater than 1, it means that the outer spray water recovery regulating valve 8 cannot meet the inner spray water demand, then set the outer spray water recovery regulating valve 8 to be fully opened, then K1 is set to 1, and the recalculated value of K2 is:

[0097]

[0098] Example

[0099] Continue to refer Figures 1 to 3 As shown, the present embodiment is a steel pipe quenching cooling water circulation system, comprising a clean water pool 1, an internal spray pool 2, an internal spray quenching device 3, an external spray quenching device 4, an external spray water collection tank 5 and a control unit.

[0100] The clean water pool 1 is connected with the inner fountain pool 2 through a clean water pipeline, and a water supply regulating valve 6 is provided on the clean water pipeline.

[0101] The internal spray quenching equipment 3 is connected to the internal spray pool 2 through an internal spray pipe, and an internal spray quenching three-way valve 7 is provided on the internal spray pipe.

[0102] The external shower quenching equipment 4 is connected to the external shower water collecting tank 5 through a pipeline, and the external shower water collecting tank 5 is connected to the internal fountain pool 2 through an external shower water pipeline. An external shower water recovery regulating valve 8 is provided on the external shower water pipeline.

[0103] The control unit is used to control the opening of the water supply regulating valve 6, the internal spray quenching three-way valve 7, and the external spray water recovery regulating valve 8.

[0104] A liquid level meter is provided in the inner fountain 2.

[0105] The liquid level value in the inner fountain 2 measured by the liquid level meter is transmitted to the control unit in real time.

[0106] This embodiment is a control method for a steel pipe quenching cooling water circulation system based on the present invention:

[0107] According to the liquid level value in the internal fountain pool 2 measured by the liquid level meter, the opening of the water supply regulating valve 6, the internal spray quenching three-way valve 7, and the external shower water recovery regulating valve 8 is executed in manual mode, gear automatic control mode or stepless automatic control mode to achieve optimal water scheduling and use.

[0108] Manual mode is as follows:

[0109] The operator manually controls the opening of the water replenishment regulating valve 6, the internal spray quenching three-way valve 7, and the external shower water recovery regulating valve 8 according to the liquid level value in the internal spray pool 2 measured by the liquid level meter and other process requirements.

[0110] In the automatic mode, the liquid level of the inner fountain pool 2 is set to the low liquid level P low , high liquid level P high , minimum limit P min and the upper limit P max Four thresholds, with values ​​of 2.9, 3.4, 3.6 and 3.9 meters respectively. In the gear automatic control mode, the opening of the corresponding valve is set according to the water demand of the external shower quenching equipment 4 and the internal spray quenching equipment 3 for different quenching processes. The setting value of the external shower water recovery regulating valve 8 In the gear automatic control mode, the opening of the corresponding valve is set according to the water demand of the external shower quenching equipment 4 and the internal spray quenching equipment 3 for different quenching processes. The external shower water recovery regulating valve 8 automatically opens to the setting value on the HMI:

[0111] When P x <3.4 meters: the external shower water recovery regulating valve 8 is set to the "large opening setting value". At this time, the liquid level in the internal fountain pool 2 is low. Open the valve opening to the maximum value to increase the liquid level as soon as possible to ensure sufficient water volume;

[0112] When P x >3.6 meters: the external spray water recovery regulating valve 8 is set to the "small opening setting value". At this time, the liquid level in the internal spray pool 2 is sufficient for internal spray quenching and is high. The water volume is supplemented by 1 / 3 of the maximum opening of the external spray water recovery regulating valve 8;

[0113] When 3.6 m < P x <3.4 meters: the external sprinkler water recovery regulating valve 8 is set to the "normal opening setting value". At this time, the liquid level in the internal fountain pool 2 is moderate, and the water can be supplemented with 2 / 3 of the maximum opening of the external sprinkler water recovery regulating valve 8.

[0114] In the gear automatic control mode, when the liquid level of the inner fountain 2 is lower than P low When the water supply regulating valve 6 is automatically opened to the set value on the HMI:

[0115] When P x <3.4 meters: the water supply regulating valve 6 is set to the "small opening setting value". At this time, the liquid level 2 in the internal spray pool is sufficient for internal spray quenching, and is high. The water supply is 1 / 3 of the maximum opening of the external spray water recovery regulating valve 6;

[0116] When P x <2.9 meters: the water supply regulating valve 6 is set to the "large opening setting value". At this time, the liquid level in the inner fountain 2 is low. The valve opening is opened to the maximum value to increase the liquid level as soon as possible to ensure sufficient water volume. If the flow rate is still not sufficient, increase the production interval time, that is, reduce the production rhythm;

[0117] When P x>3.9 meters: At this time, the liquid level in the inner fountain 2 is too high, and there is a risk of overflow, so the water supply regulating valve 6 is closed.

[0118] Adopting the stepless automatic control mode, after setting the height of the inner fountain pool 2, the opening of the external water recovery regulating valve 8, the inner spray quenching three-way valve 7 and the water supply regulating valve 6 is determined by the difference between the actual liquid level of the inner fountain pool 2 and the set liquid level height. Calculated by the following formula:

[0119]

[0120] Wherein, K0 represents the adjustment coefficient of the internal spray quenching three-way valve 7, which takes a value of 0 or 1;

[0121] K1 represents the adjustment coefficient of the external shower water recovery regulating valve 8, and its value is between 0 and 1;

[0122] K2 represents the adjustment coefficient of the water supply regulating valve 6, and its value is between 0 and 1;

[0123] Q 内 Indicates the process setting flow rate of the internal spray quenching equipment 3;

[0124] Q 外 Indicates the process setting flow rate of the external shower quenching equipment 4;

[0125] Q 补 Indicates the process set flow rate of the water supply regulating valve 6;

[0126] t 工作 Indicates the quenching working time of the steel pipe;

[0127] t 间歇 Indicates the quenching interval time of the steel pipe;

[0128] Real-time measurement of liquid level is P x , the low liquid level, high liquid level, minimum limit and maximum limit of the inner fountain pool 2 are P low , P high , P min and P max , with values ​​of 2.9, 3.4, 3.6 and 3.9 meters respectively.

[0129] (1) When P x ≥P max When the liquid level of the inner fountain 2 is higher than 3.9 meters, the liquid level is higher than the maximum limit. In order to prevent the inner fountain from overflowing, all valves leading to the inner fountain are closed, K0=K1=K2=0;

[0130] (2) When P x ≤P minWhen the liquid level of the inner fountain 2 is lower than 2.9 meters, the liquid level is lower than the minimum limit. All valve flows need to be opened to the maximum to ensure that the water volume of the inner fountain 2 is sufficient. Therefore, K0 = K1 = K2 = 1. If the flow rate is still not satisfied, it is necessary to increase t 间歇 Time, that is, reducing the production rhythm, by reducing the rhythm to ensure that the water volume in the inner fountain 2 is sufficient;

[0131] (3) When P low ≥P x ≥P min When the liquid level of the inner fountain pool 2 is higher than 2.9 meters and lower than 3.4 meters, the liquid level is higher than the minimum limit and lower than the low liquid level. At this time, the inner spray quenching three-way valve 7 needs to be opened, K0 = 1; in order to replenish the water volume of the inner fountain pool 2, the flow rate of the external shower water recovery regulating valve 8 is set to the maximum, K1 = 1. In order to reduce the influence of the water supply regulating valve 6 on the water supply flow of the external shower quenching equipment 4:

[0132]

[0133] (4) When P max ≥P x ≥P high When the liquid level of the inner fountain pool 2 is higher than 3.6 meters and lower than 3.9 meters, the liquid level is higher than the high liquid level and lower than the maximum limit, and the water volume is sufficient. Therefore, the inner spray quenching three-way valve 7 is opened, K0 = 1; the water supply regulating valve 6 is closed, K2 = 0, and K1 is calculated by formula 1;

[0134] (5) When P high ≥P x ≥P low When the liquid level of the inner fountain pool 2 is higher than 3.4 meters and lower than 3.6 meters, the liquid level is higher than the low level and lower than the high level, and the liquid level is moderate. At this time, open the inner spray quenching three-way valve 7, K0 = 1; in order to avoid affecting the flow of the outer shower quenching equipment 4, set the initial value of K2 to 0, and calculate K1 by formula 1. If the calculated value of K1 is greater than 1, it means that the outer shower water recovery regulating valve 8 cannot meet the inner spray water demand, then set the outer shower water recovery regulating valve 8 to be fully opened, K1 is set to 1, and the K2 value is recalculated:

[0135]

[0136] In this embodiment, when the internal spray quenching equipment 3 is in an intermittent state, the internal spray quenching three-way valve 7 is opened, and the water sprayed by the internal spray quenching equipment 3 is recovered to the internal spray pool 2; when the external shower quenching equipment 4 is in an intermittent state, the external shower baffle recovers the external shower water to the internal spray pool 2; in this way, the purpose of saving water is achieved, and at the same time the pressure and energy consumption of sewage treatment are reduced.

[0137] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A steel pipe quenching cooling water circulation system, characterized in that: It includes a clean water tank, an internal water spray tank, an internal spray quenching equipment, an external spray quenching equipment, an external spray water collection tank and a control unit; The clean water pool is connected to the inner fountain pool through a clean water pipeline, and a water supply regulating valve is provided on the clean water pipeline; The internal spray quenching equipment is connected to the internal spray pool through an internal spray pipe, and the internal spray pipe is provided with an internal spray quenching three-way valve; The external shower quenching equipment is connected to the external shower water collecting tank through a pipeline, and the external shower water collecting tank is connected to the internal fountain pool through an external shower water pipeline, and an external shower water recovery regulating valve is provided on the external shower water pipeline; The control unit is used to control the opening of the water replenishment regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve.

2. The steel pipe quenching cooling water circulation system according to claim 1, characterized in that: The external shower water collecting trough is also connected to the ditch.

3. The steel pipe quenching cooling water circulation system according to claim 1, characterized in that: A liquid level gauge is provided in the inner fountain; The liquid level value measured by the liquid level meter is transmitted to the control unit.

4. A control method for a steel pipe quenching cooling water circulation system according to any one of claims 1 to 3, characterized in that: According to the liquid level value measured by the liquid level meter, the opening of the water supply regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve is executed in manual mode, gear automatic control mode, or stepless automatic control mode.

5. The control method according to claim 4, characterized in that: The manual mode is as follows: The operator manually operates the opening of the water replenishment regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve according to the liquid level value measured by the liquid level meter and other process requirements.

6. The control method according to claim 4, characterized in that: In the gear automatic control mode, the external shower water recovery regulating valve automatically opens to the set value on the HMI: When P x <P low When the external shower water recovery regulating valve is set to a large opening setting value; When P x >P high When the external shower water recovery regulating valve is set to a small opening setting value; When P high <P x <P low When the external shower water recovery regulating valve is set to a normal opening setting value; Where P x Indicates the liquid level value measured by the liquid level gauge, P low Indicates the low liquid level of the inner fountain, P high Indicates the high liquid level of the inner fountain.

7. The control method according to claim 6, characterized in that: The maximum opening setting value is the fully open state of the valve; The small opening setting value is 1 / 3 of the fully open state of the valve; The normal opening setting value is 2 / 3 of the fully open state of the valve.

8. The control method according to claim 7, characterized in that: In the gear automatic control mode, when the liquid level of the inner fountain is lower than P low When the water supply regulating valve is automatically opened to the set value on the HMI: When P x <P low When the water supply regulating valve is set to a small opening setting value; When P x <P min When the water supply regulating valve is set to a large opening setting value; When P x >P high When , the water supply regulating valve is closed; Where P min Indicates the lowest limit of the inner fountain, P max Indicates the upper limit of the inner fountain.

9. The control method according to claim 8, characterized in that: In the gear automatic control mode, when the internal spray quenching equipment is in an intermittent working state, the internal spray quenching three-way valve is opened to recover the water sprayed by the internal spray quenching equipment to the internal spray pool; When the external shower quenching equipment is in an intermittent working state, the external shower baffle recovers the external shower water of the external shower quenching equipment to the external shower water collecting tank, and the external shower water recovery regulating valve is opened to supply the external shower water of the external shower water collecting tank to the internal fountain pool.

10. The control method according to claim 7, characterized in that: The stepless automatic control mode is: The liquid level height is set in the inner fountain pool, and the difference between the actual liquid level value in the inner fountain pool measured by the liquid level meter and the set liquid level height is used to set the opening of the water replenishment regulating valve, the inner spray quenching three-way valve, and the external shower water recovery regulating valve.

11. The control method according to claim 10, characterized in that: In the stepless automatic control mode, the opening settings of the water supply regulating valve, the internal spray quenching three-way valve, and the external spray water recovery regulating valve are calculated using the following formula: In the formula, K0 represents the adjustment coefficient of the internal spray quenching three-way valve, which takes the value of 0 or 1; K1 represents the adjustment coefficient of the external sprinkler water recovery regulating valve, and its value is between 0 and 1; K2 represents the adjustment coefficient of the water supply regulating valve, and its value is between 0 and 1; Q 内 Indicates the process setting flow rate of the internal spray quenching equipment; Q 外 Indicates the process setting flow rate of the external shower quenching equipment; Q 补 Indicates the process set flow rate of the water supply regulating valve; t 工作 Indicates the quenching working time of the steel pipe; t 间歇 Indicates the quenching interval time of the steel pipe; When P x ≥P max When , K0=K1=K2=0; When P x ≤P min When K0=K1=K2=1, if the flow rate is still not satisfied, increase t 间歇 time; When P low ≥P x ≥P min When K0=1, K1=1, When P max ≥P x ≥P high When , K0=1, K2=0, and K1 is calculated by formula (1); When P high ≥P x ≥P low When , K0=1, set the initial value of K2 to 0, and K1 is calculated by formula (1). If the calculated value of K1 is greater than 1, K1 is set to 1. At this time, the recalculated value of K2 is:

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