Method and system for calculating flash chamber height

Abstract

The method, device and storage medium for calculating the height of a flash chamber provided by the present disclosure comprise the following steps: obtaining a flash type of the flash chamber; obtaining the mass of a corresponding flash working medium according to the flash type; obtaining the generation amount of flash steam corresponding to the flash type according to the mass of the flash working medium; obtaining the outflow speed of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash chamber; obtaining the maximum height of droplet splashing through the amount of droplet carried by the steam and the outflow speed of the steam; and obtaining the height of the flash chamber by using the maximum height of droplet splashing. It can be known that the method provided by the present disclosure reduces the steam carrying and the manufacturing cost of the flash chamber, and avoids the phenomenon of recondensation caused by the too long rising distance of the flash steam. In addition, the method provided by the present disclosure can be applied to different flash types, and has high flexibility and wide application range.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of seawater desalination, and particularly to a method and system for calculating the height of a flash chamber and a storage medium. BACKGROUND

[0002] Flash phenomenon refers to the phenomenon that a liquid rapidly vaporizes and boils when the liquid is suddenly exposed to a low-pressure environment lower than the saturation pressure corresponding to the temperature of the liquid. Flash has the characteristics of rapid vaporization and violent boiling, and is therefore widely used in the field of seawater desalination. When flash occurs, the rising steam will carry a large amount of liquid droplets, resulting in a large vapor-liquid mixing zone during flash. This zone expands with the increase in the intensity of flash, and a large amount of liquid droplets carried will affect the vapor-liquid separation effect after flash. Therefore, the height of the flash chamber needs to be increased when designing the flash chamber, so as to reduce the steam carrying. However, if the height of the flash chamber is too high, on the one hand, the manufacturing cost of the flash chamber will increase, and on the other hand, the steam will condense again due to the long rising distance. Therefore, how to design the height of the flash chamber to guide the design and manufacture of the flash chamber is a problem to be solved. SUMMARY

[0003] The present application provides a method and system for calculating the height of a flash chamber, and a storage medium, to provide a method for calculating the height of a flash chamber, which is used for the design and manufacture of a flash chamber.

[0004] The first aspect of the present application provides a method for calculating the height of a flash chamber, comprising:

[0005] obtaining the flash type of the flash chamber;

[0006] obtaining the mass of the corresponding flash working medium according to the flash type;

[0007] obtaining the generation amount of flash steam corresponding to the flash type according to the mass of the flash working medium;

[0008] obtaining the outflow velocity of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash chamber;

[0009] obtaining the maximum height of liquid droplet splashing based on the amount of liquid droplets carried by the steam and the outflow velocity of the steam;

[0010] obtaining the height of the flash chamber based on the maximum height of liquid droplet splashing.

[0011] The second aspect of the present application provides a device for calculating the height of a flash chamber, comprising:

[0012] an obtaining module configured to obtain the flash type of the flash chamber;

[0013] The first calculation module is configured to obtain the mass of the flash evaporation working medium according to the flash evaporation type;

[0014] The second calculation module is configured to obtain the generation amount of the flash evaporation steam corresponding to the flash evaporation type according to the mass of the flash evaporation working medium;

[0015] The third calculation module is configured to obtain the outflow velocity of the steam based on the generation amount of the flash evaporation steam and the cross-sectional area of the flash evaporation cavity;

[0016] The fourth calculation module is configured to obtain the maximum height of the liquid droplet splash based on the amount of the liquid carried by the steam and the outflow velocity of the steam;

[0017] The fifth calculation module is configured to obtain the height of the flash evaporation cavity based on the maximum height of the liquid droplet splash.

[0018] The technical scheme provided by the embodiment of the present application at least brings the following beneficial effects:

[0019] The method and device for calculating the height of the flash evaporation cavity and the storage medium provided by the present disclosure obtain the flash evaporation type of the flash evaporation cavity, obtain the mass of the corresponding flash evaporation working medium according to the flash evaporation type, obtain the generation amount of the flash evaporation steam corresponding to the flash evaporation type according to the mass of the flash evaporation working medium, obtain the outflow velocity of the steam based on the generation amount of the flash evaporation steam and the cross-sectional area of the flash evaporation cavity, and obtain the maximum height of the liquid droplet splash based on the amount of the liquid carried by the steam and the outflow velocity of the steam. Then, the height of the flash evaporation cavity is obtained based on the maximum height of the liquid droplet splash. As can be seen, the method provided by the present disclosure obtains the maximum height of the liquid droplet splash through calculation, and obtains the height of the flash evaporation cavity based on the maximum height of the liquid droplet splash, thereby reducing the steam carrying and reducing the manufacturing cost of the flash evaporation cavity, and avoiding the phenomenon of recondensation due to the excessive rising distance of the flash evaporation steam. In addition, the method provided by the present disclosure can be applied to different flash evaporation types, and has high flexibility and wide application range.

[0020] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A flowchart of the method for calculating the height of the flash evaporation cavity according to an embodiment of the present application is shown;

[0023] Figure 2 The device for calculating the height of the flash evaporation cavity according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described below in detail, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0025] The method and device for calculating the height of the flash chamber according to an embodiment of the present application are described below with reference to the accompanying drawings.

[0026] Embodiment one

[0027] Figure 1 The flowchart of the method for calculating the height of the flash chamber according to an embodiment of the present application is shown in FIG. 1, which can include the following steps. Figure 1

[0028] Step 101, obtaining the flash type of the flash chamber.

[0029] In the embodiments of the present application, the flash chamber can correspond to multiple different flash types. In the embodiments of the present application, the flash type of the flash chamber can include static flash and circulating flash.

[0030] Step 102, obtaining the mass of the corresponding flash working medium according to the flash type.

[0031] In the embodiments of the present application, different flash types correspond to different masses of the flash working medium, and the unit of the mass of the flash working medium is kg / s.

[0032] Specifically, in one embodiment of the present application, when the flash type is static flash, the method for obtaining the mass of the corresponding flash working medium according to the flash type includes:

[0033] M 静态闪蒸 = cross-sectional area of the chamber body x height of the flash liquid x density of the flash liquid.

[0034] In another embodiment of the present application, when the flash type is circulating flash, the method for obtaining the mass of the corresponding flash working medium according to the flash type includes:

[0035] M 循环闪蒸 = circulating liquid flow.

[0036] Step 103, obtaining the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium.

[0037] In the embodiments of the present application, the method for obtaining the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium includes:

[0038] ​

[0039] Wherein, X is the generation amount of flash steam, M is the mass of flash working medium, h1 is the enthalpy of flash working medium solution, h sat.1 is the saturated solution enthalpy corresponding to the flash chamber pressure, h sat.g is the saturated water vapor enthalpy corresponding to the flash chamber pressure, and the above h1, h sat.1 , h sat.g can be obtained by calculation and inquiry, and the units of h1, h sat.1 , h sat.g are kJ / kg.

[0040] And in the embodiment of the present application, according to the above flash type, the mass of the flash working medium corresponding to the flash type can be brought into the above formula.

[0041] Specifically, in the embodiment of the present application, when the flash type is static flash, the corresponding M 静态闪蒸 is substituted into the above formula, and the generation amount of static flash corresponding to the flash steam can be obtained.

[0042] Step 104, based on the generation amount of flash steam and the cross-sectional area of the flash chamber, the outflow velocity of the steam is obtained.

[0043] Wherein, in the embodiment of the present application, based on the generation amount of flash steam and the cross-sectional area of the flash chamber, the method for obtaining the outflow velocity of the steam comprises:

[0044]

[0045] Wherein, V s is the outflow velocity of the steam, S0 is the cross-sectional area of the flash chamber, and the unit is m 2 .

[0046] Step 105, the maximum height of droplet splashing is obtained by the amount of droplets carried by the steam and the outflow velocity of the steam.

[0047] Wherein, in the embodiment of the present application, the amount of droplets carried by the steam and the outflow velocity of the steam satisfy formula one and formula two, wherein formula one is:

[0048]

[0049] Wherein, Y is the amount of droplets carried by the steam, and the unit is kg / m 2 · min.

[0050] Formula two is:

[0051]

[0052] Wherein, h sis the droplet splashing height, in m.

[0053] And, in the embodiment of the present application, when Y≈0 in the formula one, that is, the amount of steam carrying droplets is 0, at this time, the corresponding h s is the maximum height h of droplet splashing max , h max is the maximum height h of droplet splashing f . max is the maximum height h of droplet splashing f .

[0054] Step 106, using the maximum height of droplet splashing to obtain the height of the flash chamber.

[0055] In the embodiment of the present application, the method for obtaining the height of the flash chamber by using the maximum height of droplet splashing comprises:

[0056] h f = h max + 0.05

[0057] h f is the height of the flash chamber, in m.

[0058] The calculation method of the height of the flash chamber provided by the present disclosure obtains the flash type of the flash chamber, obtains the mass of the corresponding flash working medium according to the flash type, obtains the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium, obtains the outflow speed of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash chamber, and obtains the maximum height of droplet splashing by the amount of steam carrying droplets and the outflow speed of the steam. Then, the height of the flash chamber is obtained by using the maximum height of droplet splashing. Therefore, the method provided by the present disclosure obtains the maximum height of droplet splashing by calculation, and obtains the height of the flash chamber by using the maximum height of droplet splashing, thereby reducing steam carrying and reducing the manufacturing cost of the flash chamber, and avoiding the phenomenon of recondensation due to the too long rising distance of the flash steam. In addition, the method provided by the present disclosure can be applied to different flash types, and has high flexibility and wide application range.

[0059] Embodiment two

[0060] Figure 2 The calculation device of the height of the flash chamber provided according to an embodiment of the present application, as shown in Figure 2 , can comprise:

[0061] The acquisition module 201 is configured to acquire the flash type of the flash chamber.

[0062] The first calculation module 202 is configured to obtain the mass of the corresponding flash working medium according to the flash type.

[0063] The second calculation module 203 is configured to obtain the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium.

[0064] The third calculation module 204 is configured to obtain the outflow velocity of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash cavity.

[0065] The fourth calculation module 205 is configured to obtain the maximum height of the liquid droplet splash based on the amount of the liquid carried by the steam and the outflow velocity of the steam.

[0066] The fifth calculation module 206 is configured to obtain the height of the flash cavity based on the maximum height of the liquid droplet splash.

[0067] The calculation device for the height of the flash cavity provided by the present disclosure obtains the flash type of the flash cavity, obtains the mass of the corresponding flash working medium according to the flash type, obtains the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium, obtains the outflow velocity of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash cavity, obtains the maximum height of the liquid droplet splash based on the amount of the liquid carried by the steam and the outflow velocity of the steam, and then obtains the height of the flash cavity based on the maximum height of the liquid droplet splash. Therefore, the method provided by the present disclosure can obtain the maximum height of the liquid droplet splash through calculation, and obtain the height of the flash cavity based on the maximum height of the liquid droplet splash, so as to reduce the steam carrying, reduce the manufacturing cost of the flash cavity, and avoid the phenomenon of recondensation caused by the long rising distance of the flash steam. In addition, the method provided by the present disclosure can be applied to different flash types, and has high flexibility and wide application range.

[0068] In order to realize the above-mentioned embodiments, the present disclosure further provides a computer storage medium.

[0069] The computer storage medium provided by the embodiments of the present disclosure stores an executable program; after the executable program is executed by a processor, the method shown in Figure 1 can be realized.

[0070] In the description of the present disclosure, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present disclosure and the features of the different embodiments or examples without contradiction.

[0071] Any processes or methods described in the flow charts or otherwise described herein can be understood as representing modules, segments, or portions of code that include one or more executable instructions for implementing the specified logical functions or steps, and the preferred embodiments of the application include additional or fewer steps, in other orders, with other functionality, in implementations of these preferred embodiments of the application. Thus, any of the steps, blocks, segments, or portions of the application can be implemented by computer program instructions. In this context, a "computer" or a "processor" can be "special- purpose" computer / processors such as an ASIC, an FPGA, a hardware implementation of a software module, or general-purpose computer / processors.

[0072] Although the embodiments of the present application have been shown and described above, it should be understood by those ordinary skilled in the art that the above embodiments are exemplary and cannot be understood as limiting the present application, and those ordinary skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method of calculating a flash chamber height, characterized by, The method comprises: acquiring a flash type of a flash chamber; obtaining a mass of a corresponding flash working medium according to the flash type; obtaining a generation amount of flash steam corresponding to the flash type according to the mass of the flash working medium; obtaining an outflow velocity of the steam based on the generation amount of the flash steam and a cross-sectional area of the flash chamber; obtaining a maximum height of droplet splashing by a steam-carrying liquid amount and the outflow velocity of the steam; obtaining a height of the flash chamber by using the maximum height of droplet splashing. The obtaining of the maximum height of droplet splashing by the steam-carrying liquid amount and the outflow velocity of the steam comprises: The steam-carrying liquid amount and the outflow velocity of the steam satisfy formula one and formula two, wherein the formula one is: wherein Y is the steam-carrying liquid amount; The formula two is: wherein h s is the droplet splatter height; When Y ~ 0, the corresponding h s is the maximum height h of the droplet splash max .

2. The method of calculating the flash chamber height according to claim 1, wherein, The flash type of the flash chamber comprises static flash and circulating flash.

3. The method of calculating the flash chamber height according to claim 2, wherein, When the flash type is static flash, The obtaining of the mass of the corresponding flash working medium according to the flash type comprises: M 静态闪蒸 = chamber cross-sectional area x flash vapor liquid height x flash vapor liquid density.

4. The method of claim 2, wherein the flash chamber height is calculated by: When the flash type is circulating flash, The obtaining of the mass of the corresponding flash working medium according to the flash type comprises: M 循环闪蒸 = circulating liquid flow rate.

5. The method of claim 1, wherein, The obtaining of the generation amount of the flash steam corresponding to the flash type according to the mass of the flash working medium comprises: Wherein, X is the generation amount of the flash steam, M is the mass of the flash working medium, h1 is the enthalpy of the flash working medium solution, h sat.1 is the saturated solution enthalpy corresponding to the flash chamber pressure, h sat.g is the water vapor saturated enthalpy corresponding to the flash chamber pressure.

6. The method of calculating the flash chamber height according to claim 1, wherein, The obtaining of the outflow velocity of the steam based on the generation amount of the flash steam and the cross-sectional area of the flash chamber comprises: where V s is the outflow velocity of the vapor, S0is the cross-sectional area of the flash chamber.

7. The method for calculating the height of the flash chamber according to claim 1, characterized in that, The obtaining of the height of the flash chamber by using the maximum height of droplet splashing comprises: h f = h max + 0.05 where h f is the height of the flash chamber.

8. An apparatus for calculating a flash chamber height, comprising: The device comprises: an acquisition module, configured to acquire a flash type of a flash chamber; a first calculation module, configured to obtain a mass of a corresponding flash working medium according to the flash type; a second calculation module, configured to obtain a generation amount of flash steam corresponding to the flash type according to the mass of the flash working medium; a third calculation module, configured to obtain an outflow velocity of the steam based on the generation amount of the flash steam and a cross-sectional area of the flash chamber; a fourth calculation module, configured to obtain a maximum height of droplet splashing by a steam-carrying liquid amount and the outflow velocity of the steam; a fifth calculation module, configured to obtain a height of the flash chamber by using the maximum height of droplet splashing. The obtaining of the maximum height of droplet splashing by the steam-carrying liquid amount and the outflow velocity of the steam comprises: The steam-carrying liquid amount and the outflow velocity of the steam satisfy formula one and formula two, wherein the formula one is: wherein Y is the steam-carrying liquid amount; The formula two is: where h s is the droplet splatter height; When Y ~ 0, the corresponding h s is the maximum height h of the droplet splash max .

9. A computer storage medium, wherein, The computer storage medium stores computer executable instructions; the computer executable instructions are executed by a processor to implement the method in any of claims 1-7. The computer storage medium stores computer executable instructions; the computer executable instructions are executed by a processor to implement the method in any of claims 1-7.

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