Steam-water separation device and self-drainage method of steam-water separation device

Abstract

The invention relates to a steam-water separation device and a self-drainage method of the steam-water separation device. Wherein the steam-water separation device comprises a separator main body, a water tank arranged at the bottom of the separator main body and a drainage pipe arranged at the bottom of the water tank; a spraying system is arranged in the separator main body, and the water tank is communicated with the interior of the separator main body; the drainage pipe comprises a first pipe body and a second pipe body which are arranged in the vertical direction and have the same pipe diameter, the bottom end of the first pipe body is communicated with the bottom end of the second pipe body, and the length of the first pipe body in the vertical direction is larger than that of the second pipe body; liquid is reserved in the drainage pipe, when the separator main body is started to form negative pressure, the liquid level in the first pipe body is higher than the liquid level in the second pipe body, the liquid sprayed to the water tank by the spraying system is discharged by the drainage pipe, the pipe diameter # imgabs 0 # of the drainage pipe is determined through a formula, and the cost of the drainage pipe is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vacuum equipment, and in particular to a steam-water separation device and a self-draining method for the steam-water separation device. Background Art

[0002] The steam-water separator is one of the important components of the vacuum pump system. When the gas-liquid mixture enters the interior from the inlet of the separator, water is sprayed out through the top spray valve, so that the solid particles and dust carried in the gas are affected by gravity on the demister and flow down along the demister together with the water. Therefore, a large amount of water will be stored inside the tank. Since the inside of the tank is a negative pressure environment, the water inside the tank cannot be discharged naturally. The main existing solution is to connect a guide pipe to the bottom of the tank and use a water pump to actively drain the liquid at a fixed time. However, the use of a guide pipe and a water pump to drain water will increase the energy consumption of the steam-water separator system, and the overall cost of the steam-water separator is relatively high. Summary of the invention

[0003] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a steam-water separation device and a self-draining method for the steam-water separation device.

[0004] The present application provides a steam-water separation device, comprising a separator body, a water tank arranged at the bottom of the separator body, and a drain pipe arranged at the bottom of the water tank;

[0005] A spray system is provided in the separator body, and the water tank is communicated with the interior of the separator body;

[0006] The drainage pipe comprises a first pipe body and a second pipe body which are arranged in a vertical direction and have the same pipe diameter, the bottom end of the first pipe body is connected to the bottom end of the second pipe body, and the length of the first pipe body in the vertical direction is greater than that of the second pipe body;

[0007] Liquid is retained in the drain pipe. When the separator body is started to form a negative pressure, the liquid level in the first tube body is higher than the liquid level in the second tube body. At this time, the liquid level in the first tube body is the initial liquid level. The liquid sprayed by the spray system to the water tank is discharged by the drain pipe, wherein:

[0008] The diameter D of the drainage pipe is determined by the following formula:

[0009]

[0010] Wherein, Q is the flow rate of the spray system, ρ is the density of the sprayed liquid, and V1 is the flow velocity of the liquid in the drain pipe when the liquid in the water tank is discharged through the drain pipe;

[0011] The liquid flow rate V1 is determined by the following formula:

[0012]

[0013] Wherein, g is the acceleration of gravity, H1 is the distance that the liquid level in the water tank rises relative to the initial liquid level after the spray system has been working for a set time, and K is the resistance coefficient.

[0014] Optionally, the difference between the lengths of the first tube body and the second tube body in the vertical direction is less than or equal to H2, and the value of H2 is determined by the following formula:

[0015]

[0016] Among them, P1 is the air pressure when the separator body is working, P is the atmospheric pressure outside the separator body, ρ is the density of the sprayed liquid, g is the gravitational acceleration; and the length dimension of the first tube in the vertical direction is greater than H2.

[0017] Optionally, the multiple cross sections of the water tank in the vertical direction are equal, the initial position is at the mouth of the top end of the first tube body, and the value of H1 is determined by the following formula:

[0018]

[0019] Wherein, t is the set time, and S is the cross-sectional area of ​​the water tank.

[0020] Optionally, the cross section of the water tank is a square, and the side length L of the cross section of the water tank is determined by the following formula:

[0021] Optionally, the drain pipe further includes a third tube body, which is horizontally arranged on a side of the second tube body away from the first tube body, and is arranged vertically, with a top end of the third tube body connected to a top end of the second tube body.

[0022] Optionally, the top end of the first tube body is arranged inside the water tank, and a set distance H3 is provided between the tube opening at the top end of the first tube body and the bottom wall inside the water tank.

[0023] Optionally, the height dimension of the water tank in the vertical direction is H, and H>H1+H3.

[0024] Optionally, a one-way valve is provided at one end of the drain pipe away from the water tank.

[0025] Optionally, the water tank is provided with a sewage pipe connected to the water tank, and the sewage pipe is provided with a sewage valve. When the sewage valve is opened, the water tank is connected to the outside through the sewage pipe, and when the sewage valve is closed, the sewage pipe is closed.

[0026] A second aspect of the present application provides a self-draining method for a steam-water separation device, which is applied to the steam-water separation device as described in any one of the above items, comprising the following steps:

[0027] Retaining liquid in the drain pipe, activating the separator body to form a negative pressure in the separator body so that the liquid level in the first tube body rises relative to the liquid level in the second tube body;

[0028] The separator body sucks in the steam-water mixture, and the spraying system sprays at a flow rate Q, and the sprayed liquid carries impurities into the water tank to raise the liquid level in the water tank;

[0029] The liquid in the water tank is discharged from the water tank through a drain pipe.

[0030] Compared with the prior art, the technical solution provided by this application has the following advantages:

[0031] The present application provides a steam-water separation device and a self-draining method for the steam-water separation device. The steam-water separation device includes a separator body, a water tank arranged at the bottom of the separator body, and a drain pipe arranged at the bottom of the water tank; a spray system is arranged in the separator body, and the water tank is connected to the inside of the separator body; the drain pipe includes a first tube body and a second tube body arranged in a vertical direction and having the same tube diameter, the bottom end of the first tube body is connected to the bottom end of the second tube body, and the length of the first tube body in the vertical direction is greater than the tube body; liquid is retained in the drain pipe, so that the drain pipe is in a sealed state, and when the separator body is started to form a negative pressure, the liquid level in the first tube body is higher than the liquid level in the second tube body, and the position of the liquid level in the first tube body is the initial position at this time, and the liquid sprayed to the water tank by the spray system is discharged by the drain pipe, wherein: the diameter D of the drain pipe is determined by the following formula: Where Q is the flow rate of the spray system, ρ is the density of the sprayed liquid, and V1 is the flow velocity of the liquid in the drain pipe when the liquid in the water tank is discharged through the drain pipe. The liquid flow velocity V1 is determined by the following formula: Among them, g is the acceleration of gravity, H1 is the distance that the liquid level in the water tank rises relative to the initial position after the spray system has been working for a set time, and K is the resistance coefficient. The diameter D of the drain pipe is determined by H1 and the flow rate Q. Under the premise of being able to discharge the liquid in the water tank, the drain pipe with the smallest diameter can be used to reduce costs. The drain pipe forms a communicating vessel between the separator body and the external environment. When the liquid accumulates in the water tank, the pressure of the liquid in the water tank destroys the pressure balance at both ends of the drain pipe, thereby driving the drain pipe to discharge the liquid in the water tank. After the liquid accumulates in the water tank, the drain pipe automatically discharges the liquid in the water tank, avoiding the need to set a guide pipe and a water pump on the steam-water separator, and reducing the energy consumption and cost of the steam-water separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 This is a front view of the steam-water separator described in the embodiment of the present application;

[0035] Figure 2 A side view of the steam-water separator according to an embodiment of the present application;

[0036] Figure 3 A cross-sectional view of the steam-water separator described in an embodiment of the present application;

[0037] Figure 4 A partial cross-sectional view of the steam-water separator described in the embodiment of the present application;

[0038] Figure 5 This is a flow chart of the self-draining method of the steam-water separation device described in an embodiment of the present application.

[0039] Among them, 1. separator body; 2. water tank; 21. drain valve; 3. drain pipe; 31. first pipe body; 32. second pipe body; 33. third pipe body; 34. one-way valve. DETAILED DESCRIPTION

[0040] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0041] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0042] Reference Figures 1 to 4As shown, the embodiment of the present application provides a steam-water separator, comprising a separator body 1, a water tank 2 arranged at the bottom of the separator body 1, and a drain pipe 3 arranged at the bottom of the water tank 2; a spray system is arranged in the separator body 1, and the water tank 2 is connected to the inside of the separator body 1; the drain pipe 3 comprises a first tube body 31 and a second tube body 32 arranged in a vertical direction and having the same tube diameter, the bottom end of the first tube body 31 is connected to the bottom end of the second tube body 32, and the length of the first tube body 31 in the vertical direction is greater than that of the second tube body 32; liquid is retained in the drain pipe 3, and when the separator body 1 is started to form a negative pressure, the liquid level in the first tube body 31 is higher than the liquid level in the second tube body 32, and the liquid level in the first tube body 31 is the initial liquid level, and the liquid sprayed by the spray system to the water tank 2 is discharged by the drain pipe 3, wherein:

[0043] The pipe diameter D of the drainage pipe 3 is determined by the following formula:

[0044]

[0045] Wherein, Q is the flow rate of the spray system, ρ is the density of the sprayed liquid, and V1 is the flow velocity of the liquid in the drain pipe 3 when the liquid in the water tank 2 is discharged through the drain pipe 3;

[0046] The liquid flow velocity V1 is determined by the following formula:

[0047]

[0048] Wherein, g is the acceleration due to gravity, H1 is the distance that the liquid level in the water tank 2 rises relative to the initial liquid level after the spray system has been working for a set time, and K is the resistance coefficient.

[0049] Specifically, the separator body 1 has a cavity inside, and the spray system is arranged in the cavity inside the separator body 1. The separator body 1 is connected to a vacuum pump. After the vacuum pump is started, the cavity inside the separator body 1 will be in a negative pressure state for a long time. The cavity inside the separator body 1 mainly receives the gas-liquid mixture, and the spray system sprays liquid into the gas-liquid mixture, so that the fixed particles of the gas-liquid mixture fall with the liquid, and the liquid sprayed by the spray system will gather at the bottom of the cavity inside the separator body 1.

[0050] The water tank 2 is arranged at the bottom of the separator body 1, and the water tank 2 is connected to the internal cavity of the separator body 1. The water tank 2 and the separator body 1 are sealed so that the water tank 2 does not affect the negative pressure environment in the separator body 1. The liquid in the cavity of the separator body 1 will enter the water tank 2 under the action of gravity.

[0051] The above-mentioned drain pipe 3 is arranged at the bottom of the water tank 2, so that the liquid enters the drain pipe 3 under the action of gravity. The first tube body 31 and the second tube body 32 of the drain pipe 3 can form a U-shaped tube structure. When there is water in the drain pipe 3, the external gas will not enter the water tank 2 and the cavity of the separator main body 1 through the drain pipe 3, that is, the water in the drain pipe 3 forms a water seal so that the cavity of the separator main body 1 can maintain a negative pressure.

[0052] When the air pressure at the two ends of the drain pipe 3 is the same, the liquid levels at the two ends of the U-shaped pipe will be consistent. When liquid is added to the pipe mouth at one end, the liquid in the U-shaped pipe will flow, so that the liquid levels at the two ends of the pipe mouth remain flush. When a negative pressure environment is formed in the separator body 1, the liquid level in the first tube body 31 will be above the liquid level in the second tube body 32, that is, the liquid levels at the two ends of the U-shaped drain pipe 3 are at different heights.

[0053] Therefore, the vertical length of the first tube body 31 needs to be greater than the set length; when the vertical length of the first tube body 31 is less than the set length, when the cavity of the separator main body 1 is under negative pressure, if the liquid moves into the first tube body 31, the pressure of the liquid in the first tube body 31 cannot reach a balance relative to the pressure difference between the separator main body 1 and the atmospheric pressure. At this time, there needs to be accumulated water in the water tank 2 so that the common water pressure of the accumulated water in the water tank 2 and the liquid in the first tube body 31 can reach a balance relative to the pressure difference between the separator main body 1 and the atmospheric pressure; when the length of the first tube body 31 is shorter, the higher the liquid level height of the liquid in the water tank 2 required to achieve pressure balance in the drain pipe 3, making the space in the water tank 2 smaller, so that the liquid sprayed by the spray system enters the water tank 2 and easily overflows from the water tank 2, resulting in excessive water accumulation in the separator main body 1 and inability to work normally.

[0054] And before the separator main body 1 is started, water needs to be released into the drain pipe 3 for water sealing. When the length of the first tube body 31 is short, after the separator main body 1 is started, the liquid in the first tube body 31 will be sucked back into the water tank 2. Since the water pressure of the liquid is related to the height of the liquid, the volume of the water tank 2 is larger than the volume of the first tube body 31. After the liquid in the first tube body 31 enters the water tank 2, the height of the liquid in the water tank 2 changes very little, that is, even if all the liquid in the first tube body 31 enters the water tank 2, the liquid in the drain pipe 3 cannot reach a pressure equilibrium state, causing the water seal of the drain pipe 3 to fail, resulting in the cavity in the separator main body 1 being connected to the outside through the drain pipe 3.

[0055] The set length of the first tube body 31 can be selected based on the air pressure P1 when the separator body 1 is working. According to P1=ρgh, h=P1 / ρg is obtained, where ρ is the density of the liquid sprayed by the spray system, g is the gravity acceleration, and h is the set length. The first tube body 31 is greater than the set length h, and even if the liquid in the drain pipe 3 moves into the first tube body 31 under the action of the air pressure difference, the liquid can be in the first tube body 31 and will not flow back into the water tank 2.

[0056] When water sealing the drain pipe 3, it is necessary to first supply water to the end of the drain pipe 3 away from the water tank 2 so that there is liquid in the drain pipe 3. After starting the separator body 1, a negative pressure is formed in the cavity, and the liquid in the drain pipe 3 moves toward the first tube body 31. The liquid level in the first tube body 31 is higher than the liquid level in the second tube body 32. At this time, the liquid level in the first tube body 31 is the initial position, and the liquid in the drain pipe 3 is in a static state and does not flow; when the flow rate of the liquid sprayed by the spray system is large, the liquid will accumulate quickly when entering the water tank 2, causing the liquid level in the water tank 2 to rise, thereby changing the pressure balance at both ends of the drain pipe 3, causing the liquid to flow along the first tube body 31 toward the second tube body 32, so that the liquid in the drain pipe 3 is discharged from the drain pipe 3. When the pressure at both ends of the drain pipe 3 is rebalanced, the liquid in the drain pipe 3 returns to a static state.

[0057] The water flow velocity V1 in the above-mentioned drainage pipe 3 is determined by the following formula:

[0058]

[0059] First, the water flow velocity in the U-tube can be obtained according to the Bernoulli equation:

[0060]

[0061] When the liquid level is flush with the nozzle at the top of the first tube body 31 at the initial position, H1 is the height to which the water level in the water tank 2 rises due to the spray system within the set time. When the initial position is below the nozzle at the top of the first tube body 31, there is a certain space between the liquid level in the first tube body 31 and the nozzle of the first tube body 31. When the water sprayed by the spray system enters the water tank 2, the liquid in the water tank 2 will first enter the first tube body 31 to fill the first tube body 31, and then accumulate at the bottom of the water tank 2. The cross-sectional area of ​​the first tube body 31 is much smaller than the volume of the water tank 2, and the space of the first tube body 31 can be filled in a very short time. Before the liquid in the drain pipe 3 flows out of the drain pipe 3, the first tube body 31 is filled, so the liquid in the water tank 2 will gather and the liquid level will rise, thereby increasing H1. Moreover, the volume of water used to fill the first tube body 31 is small, and the overall effect on the rise of the liquid level in the water tank 2 is very small and can be ignored. Therefore, H1 is the distance that the liquid level in the water tank 2 rises relative to the initial position after the spray system works for the set time.

[0062] H1 can reflect the change in the pressure of the liquid in the water tank 2 on the liquid in the drain pipe 3. The value of H1 can be determined by measuring the change in the liquid level after the spray system has been working for a set time. Of course, it can also be obtained by calculating the flow rate Q of the spray system, the bottom area of ​​the water tank 2, and the set spray time t when the initial position is flush with the pipe mouth of the first pipe body 31.

[0063] After V1 is calculated, according to the relationship between flow rate and pipe diameter:

[0064]

[0065] The formula for the diameter D of the drainage pipe 3 is derived as follows:

[0066]

[0067] The flow rate Q of the spray system can be obtained according to the design and actual measurement of the gas-water separation device, ρ is the density of the sprayed liquid, V1 can be obtained according to calculation, and after being substituted, it can be known that the diameter D of the drain pipe 3 is inversely proportional to H1, that is, the larger H1 is, the faster the flow rate of the liquid in the drain pipe 3 is, and the smaller the diameter of the drain pipe 3 is. The calculated D is the minimum diameter of the drain pipe 3, that is, when the liquid level is H1, the drain pipe 3 with a diameter of D can just discharge all the liquid sprayed by the spray system collected by the water tank 2 within the set time. When the diameter of the drain pipe 3 is greater than D, the liquid can discharge more liquid through the drain pipe 3 at the same flow rate, that is, when the diameter of the drain pipe 3 is greater than D, the drain pipe 3 can also discharge all the liquid sprayed by the spray system from the water tank 2 within the set time.

[0068] When the steam-water separator provided by the present application is used, liquid is first input into the drain pipe 3 to form a water seal, so that the gas cannot enter the water tank 2 through the drain pipe 3, and the separator body 1 is started, and a negative pressure is formed in the cavity of the separator body 1, and the liquid in the drain pipe 3 flows along the second tube body 32 in the direction of the first tube body 31. When the liquid in the drain pipe 3 reaches equilibrium, the liquid level in the first tube body 31 is greater than the liquid level in the second tube body 32. The spray system is started to spray liquid in the cavity of the separator body 1, and the liquid gathers in the water tank 2 to raise the liquid level in the water tank 2. The water gathered in the water tank 2 increases the water pressure at the first tube body 31, so that the liquid in the drain pipe 3 flows along the first tube body 31 toward the second tube body 32, so that the liquid in the drain pipe 3 is discharged through the second tube body 32. When the liquid level in the water tank 2 is flush with the initial position, the liquid in the drain pipe 3 stops flowing.

[0069] The steam-water separator provided in the present application comprises a separator body 1, a water tank 2 arranged at the bottom of the separator body 1, and a drain pipe 3 arranged at the bottom of the water tank 2; a spray system is arranged in the separator body 1, and the water tank 2 is connected to the inside of the separator body 1; the drain pipe 3 comprises a first tube body 31 and a second tube body 32 arranged in a vertical direction and having the same tube diameter, the bottom end of the first tube body 31 is connected to the bottom end of the second tube body 32, and the length of the first tube body 31 in the vertical direction is greater than that of the second tube body 32; liquid is retained in the drain pipe 3, so that the drain pipe 3 is in a sealed state, and when the separator body 1 is started to form a negative pressure, the liquid level in the first tube body 31 is higher than the liquid level in the second tube body 32, and the position of the liquid level in the first tube body 31 is the initial position at this time, and the liquid sprayed by the spray system to the water tank 2 is discharged by the drain pipe 3, wherein: the tube diameter D of the drain pipe 3 is determined by the following formula: Wherein, Q is the flow rate of the spray system, ρ is the density of the sprayed liquid, and V1 is the flow velocity of the liquid in the drain pipe 3 when the liquid in the water tank 2 is discharged through the drain pipe 3; the liquid flow velocity V1 is determined by the following formula: Among them, g is the acceleration of gravity, H1 is the distance that the liquid level in the water tank 2 rises relative to the initial position after the spray system has been working for a set time, and K is the resistance coefficient. The diameter D of the drain pipe 3 is determined by H1 and the flow rate Q. Under the premise of being able to discharge the liquid in the water tank 2, the drain pipe 3 with the smallest diameter can be used to reduce costs. The drain pipe 3 forms a communicating vessel between the separator body 1 and the external environment, so that when the liquid in the water tank 2 accumulates, the pressure of the liquid in the water tank 2 destroys the pressure balance at both ends of the drain pipe 3, thereby driving the drain pipe 3 to discharge the liquid in the water tank 2, so that the drain pipe 3 automatically discharges the liquid in the water tank 2 after the liquid accumulates in the water tank 2, avoiding the need to set a guide pipe and a water pump on the steam-water separator, and reducing the energy consumption and cost of the steam-water separator.

[0070] Reference Figures 1 to 3 As shown, in some embodiments, the difference between the lengths of the first tube body 31 and the second tube body 32 in the vertical direction is less than or equal to H2, and the value of H2 is determined by the following formula: Wherein, P1 is the air pressure when the separator body 1 is working, P is the atmospheric pressure outside the separator body 1, ρ is the density of the sprayed liquid, g is the gravitational acceleration; and the length dimension of the first tube body 31 in the vertical direction is greater than H2.

[0071] With such arrangement, after the separator body 1 is started, it can ensure that the liquid in the drain pipe 3 is stably retained in the drain pipe 3 to seal the drain pipe 3, so that the separator body 1 is in a sealed state and the negative pressure is stably maintained.

[0072] Specifically, since negative pressure is formed after the separator body 1 is started, the liquid level in the first tube body 31 is above the liquid level in the second tube body 32 after the separator body 1 is started, so that the difference between the water pressure of the liquid in the drain pipe 3 and the air pressure at both ends of the drain pipe 3 is equal, so that the liquid in the drain pipe 3 is in a balanced state and remains static. After the separator body 1 is started, since the liquid level in the first tube body 31 is above the liquid level in the second tube body 32, the length of the second tube body 32 is less than the length of the first tube body 31, so that the drain pipe 3 can accommodate liquid in a pressure balanced state; compared with the case where the lengths of the first tube body 31 and the second tube body 32 are equal, the length dimension of the first tube body 31 in the vertical direction is greater than the length dimension of the second tube body 32 in the vertical direction, which can reduce the material used for the second tube body 32 and reduce the cost of the drain pipe 3, and the liquid in the second tube body 32 can be discharged from the second tube body 32 when the liquid level rises to a small height, so that the liquid in the water tank 2 can be discharged through the drain pipe 3.

[0073] Moreover, the vertical dimension of the first tube body 31 is larger than H2. Even if the liquid is in the first tube body 31, the water pressure of the liquid in the first tube body 31 can be balanced with the air pressure difference at both ends of the drain pipe 3, thereby preventing the liquid in the first tube body 31 from flowing back into the water tank 2 under the external air pressure, causing the water seal of the drain pipe 3 to the water tank 2 to fail.

[0074] According to the water pressure calculation formula: P = ρgh, h = P / ρg can be deduced. For the U-shaped drain pipe 3, P is the pressure difference at both ends of the U-shaped pipe, and the calculated h is the height difference of the liquid level at both ends of the U-shaped pipe. The length dimension of the first pipe body 31 in the vertical direction is greater than h.

[0075] Reference Figure 3 and Figure 4 As shown, in some embodiments, multiple cross sections of the water tank 2 in the vertical direction are equal, and the initial position is at the mouth of the top end of the first tube body 31. The value of H1 is determined by the following formula:

[0076]

[0077] Wherein, t is the set time, and S is the cross-sectional area of ​​the water tank 2. In this way, the value of H1 can be determined by the set time t and the cross-sectional area of ​​the water tank 2, and the relationship between V1, the set time t and the cross-sectional area S, and the relationship between the pipe diameter D, the set time t and the cross-sectional area S, can be further determined, which provides guidance for determining the pipe diameter D of the drainage pipe 3.

[0078] Specifically, the water tank 2 can be selected as a cylindrical structure, or of course, a rectangular parallelepiped structure, and the areas and shapes of multiple cross sections of the water tank 2 in the vertical direction are equal, that is, the volume of the water tank 2 is the area S of the cross section multiplied by the height H of the water tank 2 in the vertical direction, that is, the volume of the water tank 2 V=H*S. When the liquid accumulates in the water tank 2, the cross section of the liquid is equal to the cross section of the water tank 2, and the liquid level in the first tube body 31 is flush with the tube mouth at the top of the first tube body 31 at the initial position, so that H1 is the distance between the liquid level in the water tank 2 and the liquid level at the initial position.

[0079] The above-mentioned set time is t, and the liquid sprayed by the spray system can be discharged through the drain pipe 3, that is, at time t, all the liquid between the reference surface and the liquid level at H1 in the water tank 2 can be discharged through the drain pipe 3.

[0080] The flow rate formula is Q = S1 * V3, where V3 is the water flow velocity, S1 is the cross-sectional area, and because V3 = L1 / t, where L1 is the distance the water flows, and t is the time the water flows, the flow rate formula is Q = (S1*L1) / t, and S*L1 is the volume V of the liquid flowing through the cross section within t time, where H1 and L1 have the same physical meaning, and S and S1 have the same physical meaning, that is, H1*S is the volume of liquid entering the water tank 2 by the spray system within t time, so it can be deduced that H1 = Qt / S. The cross-sectional area of ​​the water tank 2 is a constant, the flow rate Q is a constant, and H1 is proportional to the working time of the spray system.

[0081] Within time t, all the liquid between the liquid level at the initial position and the liquid level at H1 in water tank 2 is discharged through drain pipe 3 to prevent the liquid in water tank 2 from continuing to rise. That is, all the liquid sprayed by the sprinkler system within time t needs to be discharged from water tank 2. Substitute H1=Qt / S into the formula of V1 and D to calculate the relationship between D and t.

[0082] Substituting H1=Qt / S into V1, we can get Substituting the above V1 into D, we can obtain that D is inversely proportional to t, that is, the larger t is, the smaller D is; wherein D is a formula related to t, which can be expressed as when the diameter of the selected drain pipe 3 is D, the drain pipe 3 can completely discharge the liquid in the water tank 2 corresponding to the increase of H1 relative to the initial position within the time length t.

[0083] A shorter time can be selected when selecting the above t, because the volume of liquid that can be contained in the water tank 2 is limited, and the accumulation of liquid in the water tank 2 will destroy the pressure balance at both ends of the drain pipe 3, causing the liquid in the drain pipe 3 to start flowing and drain. Therefore, as long as the liquid level in the water tank 2 does not rise too high and overflow from the water tank 2 within a short period of time, it will be sufficient.

[0084] Reference Figure 3 and Figure 4 As shown, in some embodiments, the cross section of the water tank 2 is a square, and the side length L of the cross section of the water tank 2 is determined by the following formula: With such arrangement, the side length L of the cross section can be conveniently determined by a formula, so that the size of the water tank 2 can be conveniently determined according to the formula, so that the size of the water tank 2 matches the size of the drain pipe 3.

[0085] Specifically, the cross section is a square, L*L is the area S of the cross section, and according to the above H1=Qt / S, it can be deduced that

[0086] Reference Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the drain pipe 3 further includes a third tube body 33, which is horizontally arranged on a side of the second tube body 32 away from the first tube body 31, and is arranged vertically, with the top of the third tube body 33 connected to the top of the second tube body 32. In this way, the third tube body 33 can protect the tube opening at the top of the second tube body 32 to prevent foreign matter from falling and entering the second tube body 32.

[0087] Specifically, the third tube body 33 and the second tube body 32 can be connected to each other using a U-shaped tube body. The top of the third tube body 33 is connected to the top of the second tube body 32, and the other end is connected to the outside, so that the liquid can be discharged from the bottom of the third tube body 33. The third tube body 33 can cover the tube opening at the top of the second tube body 32 to prevent foreign matter from entering the third tube body 33.

[0088] Reference Figure 3 and Figure 4 As shown, in some embodiments, the top end of the first tube body 31 is disposed inside the water tank 2, and a set distance H3 is provided between the top end of the first tube body 31 and the bottom wall inside the water tank 2. In this arrangement, since the liquid sprayed by the spray system will absorb the dust particles in the separator body 1, the impurities in the liquid in the water tank 2 will settle on the bottom wall of the water tank 2, and the end of the first tube body 31 is spaced from the bottom wall of the water tank 2, which can prevent the impurities in the liquid in the water tank 2 from entering the first tube body 31 and blocking the drain pipe 3.

[0089] Specifically, the end of the first tube body 31 away from the ground in the vertical direction is the top of the first tube body 31, and the top of the first tube body 31 is inserted into the water tank 2, so that the pipe mouth at the top of the first tube body 31 and the bottom wall of the water tank 2 are spaced apart in the vertical direction, and the distance between the end of the first tube body 31 and the bottom wall of the water tank 2 is H3. When the separator body 1 is started to form a negative pressure, there is no liquid in the water tank 2. When the spray system is started, liquid accumulates in the water tank 2. When the height of the liquid in the water tank 2 reaches H3, the liquid in the water tank 2 can enter the first tube body 31, that is, after the spray system is started, the liquid level height of the liquid in the water tank 2 is greater than H3, so that the liquid in the water tank 2 contacts the liquid in the first tube body 31, and then the set time t is selected and H1 is calculated.

[0090] Reference Figure 3 and Figure 4 As shown, in some embodiments, the height of the water tank 2 in the vertical direction is H, and H>H1+H3. This arrangement allows the water tank 2 to have enough space to accommodate the liquid sprayed by the spray system, thereby preventing the liquid in the water tank 2 from overflowing.

[0091] Specifically, the height of the water tank 2 in the vertical direction is greater than the sum of H1 and H3, so that the water tank 2 has enough space to carry the water sprayed by the spray system within the set time to ensure that the liquid in the water tank 2 will not overflow from the water tank 2 and affect the operation of the separator body 1.

[0092] Reference Figure 3 and Figure 4 As shown, in some embodiments, a one-way valve 34 is provided at one end of the drain pipe 3 away from the water tank 2. With such a configuration, the one-way valve 34 can allow the liquid in the drain pipe 3 to flow out of the drain pipe 3 smoothly, and prevent the liquid or gas outside the drain pipe 3 from entering the drain pipe 3, thereby avoiding the back suction phenomenon during the drainage process, and allowing the gas or liquid outside the drain pipe 3 to enter the drain pipe 3.

[0093] Specifically, a plurality of rubber sheets that can be close to each other and fit together can be selected to be set as a one-way valve 34 at the end of the drain pipe 3 away from the water tank 2. When liquid flows out of the drain pipe 3, the rubber sheets move away from each other under the impact of the liquid, so that the liquid can flow out of the drain pipe 3 through the one-way valve 34. When the liquid stops flowing, the plurality of rubber sheets fit together to seal the drain pipe 3, so that gas and liquid cannot enter the drain pipe 3 through the one-way valve 34.

[0094] Of course, you can also choose a one-way valve 34 that includes a mounting ring and a rotating plate. The rotating plate is rotatably set on the mounting ring. The rotating plate and the mounting ring are connected to each other by a spring. The elastic force of the spring is applied to the rotating plate in the direction toward the inside of the drain pipe 3, so that the rotating plate covers the mounting ring. The mounting ring is installed at the pipe mouth of the drain pipe 3 at one end away from the water tank 2; when liquid flows out of the drain pipe 3, the impact force of the liquid overcomes the elastic force of the spring and drives the rotating plate to rotate relative to the mounting ring in the direction away from the drain pipe 3, so that the liquid can flow out of the drain pipe 3; when liquid or gas flows from the outside of the drain pipe 3 to the inside of the drain pipe 3, the elastic force of the spring drives the rotating plate to cover the mounting ring to prevent the liquid or gas from entering the drain pipe 3.

[0095] Reference Figures 1 to 4 As shown, in some embodiments, the water tank 2 is provided with a drain pipe connected to the water tank 2, and the drain pipe is provided with a drain valve 21. When the drain valve 21 is opened, the water tank 2 is connected to the outside through the drain pipe, and when the drain valve 21 is closed, the drain pipe is closed. In this way, impurities precipitated in the water tank 2 can be discharged from the water tank 2 through the drain pipe when the drain valve 21 is opened, so that the impurities precipitated in the water tank 2 can be cleaned regularly.

[0096] Specifically, the drain pipe is arranged at the bottom of the water tank 2 and connected to the water tank 2. A drain valve 21 is arranged on the drain pipe. When the drain valve 21 is opened, the drain pipe connects the water tank 2 with the outside, and the impurities precipitated in the water tank 2 can be discharged from the water tank 2 through the drain pipe. When the separator body 1 needs to be started to form a negative pressure, the drain valve 21 is closed to close the drain pipe, so that the cavity inside the separator body 1 can be kept in a negative pressure state.

[0097] Reference Figure 5 As shown, the embodiment of the present application also provides a self-draining method for a steam-water separator, which is applied to the above steam-water separation device, and includes the following steps:

[0098] Step S1, liquid is retained in the drain pipe 3, and the separator body 1 is started to form a negative pressure in the separator body 1, so that the liquid level in the first tube body 31 rises relative to the liquid level in the second tube body 32; after the separator body 1 is started, the liquid level in the first tube body 31 rises to the reference position, and the liquid in the drain pipe 3 forms a water seal, so that the separator body 1 can be maintained in a negative pressure state.

[0099] In step S2, the separator body sucks in the steam-water mixture, and the spraying system sprays at a flow rate Q, and the sprayed liquid carries impurities into the water tank 2 to increase the liquid level in the water tank 2; the liquid sprayed by the spraying system flows into the water tank 2 under the action of its own gravity, so that the water tank 2 plays a collecting role, and the increase in the liquid level in the water tank 2 will change the pressure balance at both ends of the drain pipe 3, causing the liquid in the drain pipe 3 to flow.

[0100] Step S3, the liquid in the water tank 2 is discharged from the water tank 2 through the drain pipe 3. Specifically, the liquid level in the water tank 2 rises, so that the overall height of the liquid in the first tube body 31 increases and the water pressure increases, the pressure balance at both ends of the drain pipe 3 is broken, and the liquid in the water tank 2 is discharged from the water tank 2 through the drain pipe 3. When the liquid in the water tank 2 is discharged, the water pressure corresponding to the liquid level difference between the first tube body 31 and the second tube body 32 is equal to the air pressure difference between the cavity of the separator main body 1 and the outside world, the drain pipe 3 stops automatically draining.

[0101] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0102] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steam-water separation device, characterized in that: It comprises a separator body (1), a water tank (2) arranged at the bottom of the separator body (1), and a drainage pipe (3) arranged at the bottom of the water tank (2); The separator body (1) is provided with a spray system, and the water tank (2) is in communication with the interior of the separator body (1); The drainage pipe (3) comprises a first pipe body (31) and a second pipe body (32) which are arranged in a vertical direction and have the same pipe diameter; the bottom end of the first pipe body (31) is connected to the bottom end of the second pipe body (32); the length of the first pipe body (31) in the vertical direction is greater than that of the second pipe body (32); Liquid is retained in the drainage pipe (3). When the separator body (1) is activated to form a negative pressure, the liquid level in the first tube body (31) is higher than the liquid level in the second tube body (32). At this time, the position of the liquid level in the first tube body (31) is an initial position. The liquid sprayed by the spray system to the water tank (2) is discharged by the drainage pipe (3), wherein: The pipe diameter D of the drainage pipe (3) is determined by the following formula: Wherein, Q is the flow rate of the spraying system, ρ is the density of the sprayed liquid, and V1 is the flow velocity of the liquid in the drain pipe (3) when the liquid in the water tank (2) is discharged through the drain pipe (3); The liquid flow rate V1 is determined by the following formula: Wherein, g is the acceleration due to gravity, H1 is the distance that the liquid level in the water tank (2) rises relative to the initial position after the spray system has been operating for a set time, and K is the resistance coefficient.

2. The steam-water separation device according to claim 1, characterized in that: The difference between the lengths of the first tube body (31) and the second tube body (32) in the vertical direction is less than or equal to H2, and the value of H2 is determined by the following formula: Wherein, P1 is the air pressure when the separator body (1) is working, P is the atmospheric pressure outside the separator body (1), ρ is the density of the sprayed liquid, and g is the gravitational acceleration; and the length dimension of the first tube (31) in the vertical direction is greater than H2.

3. The steam-water separation device according to claim 1, characterized in that: The multiple cross sections of the water tank (2) in the vertical direction are all equal, the initial position is at the mouth of the top end of the first tube body (31), and the value of H1 is determined by the following formula: Wherein, t is the set time, and S is the cross-sectional area of ​​the water tank (2).

4. The steam-water separation device according to claim 3, characterized in that: The cross section of the water tank (2) is a square, and the side length L of the cross section of the water tank (2) is determined by the following formula:

5. The steam-water separation device according to claim 1, characterized in that: The drainage pipe (3) further comprises a third pipe body (33), wherein the third pipe body (33) is arranged in the horizontal direction on a side of the second pipe body (32) away from the first pipe body (31), and the third pipe body (33) is arranged in the vertical direction, and the top end of the third pipe body (33) is connected to the top end of the second pipe body (32).

6. The steam-water separation device according to claim 1, characterized in that: The top end of the first tube body (31) is arranged inside the water tank (2), and a set distance H3 is provided between the tube opening at the top end of the first tube body (31) and the bottom wall inside the water tank (2).

7. The steam-water separation device according to claim 6, characterized in that: The height dimension of the water tank (2) in the vertical direction is H, and H>H1+H3.

8. The steam-water separation device according to any one of claims 1 to 7, characterized in that: A one-way valve (34) is provided at one end of the drainage pipe (3) away from the water tank (2).

9. The steam-water separation device according to any one of claims 1 to 7, characterized in that: The water tank (2) is provided with a sewage pipe connected to the water tank (2), and the sewage pipe is provided with a sewage valve (21). When the sewage valve (21) is opened, the water tank (2) is connected to the outside through the sewage pipe, and when the sewage valve (21) is closed, the sewage pipe is closed.

10. A self-draining method for a steam-water separation device, characterized in that: The steam-water separation device according to any one of claims 1 to 9 comprises the following steps: Liquid is retained in the drain pipe (3), and the separator body (1) is activated to form a negative pressure in the separator body (1), so that the liquid level in the first tube body (31) rises relative to the liquid level in the second tube body (32); The separator body sucks in the steam-water mixture, and the spraying system sprays at a flow rate Q, and the sprayed liquid carries impurities and flows into the water tank (2), so that the liquid level in the water tank (2) rises; The liquid in the water tank (2) is discharged from the water tank (2) through a drain pipe (3).

Images