Calculation method of flash evaporator

Abstract

The invention relates to a calculation method of a flash evaporator, belongs to the technical field of energy utilization and power engineering, and solves the problem of waste of low-quality waste heat resources in traditional energy enterprises and the problem of damage to blades of a steam turbine caused by poor separator effect of the flash evaporator due to defects of a calculation method of the flash evaporator. Based on the relation between the water boiling point and the pressure and the control key parameters, the flash evaporation steam amount is calculated through a specific formula, heat balance calculation and multi-stage flash evaporation setting are combined, the design of the flash evaporator is optimized, efficient waste heat recycling is achieved, and the performance of a power generation system is improved. The waste heat utilization efficiency is improved, and energy waste is reduced; turbine blades are prevented from being damaged, and the power generation system stability is improved; the development of a low-temperature waste heat power generation technology is promoted, energy conservation and environmental protection are assisted, the requirements of multiple industries are met, and an effective solution is provided for energy structure optimization.

Description

Technical Field

[0001] The invention relates to a calculation method for a flash evaporator, and belongs to the technical field of energy utilization and power engineering. Background Art

[0002] In the field of energy utilization, with the continuous growth of global demand for energy and the increasing awareness of environmental protection, improving energy utilization efficiency and reducing energy waste have become key tasks. Traditional energy companies often generate a large amount of waste heat resources in the production process, among which the treatment of low-quality waste heat resources has always been a difficult problem. At present, many traditional energy companies mostly adopt condensation, continuous sewage discharge and regular sewage discharge for low-quality waste heat resources. This practice not only causes serious waste of resources, but also these waste heat are directly discharged into the environment, which will also cause a series of environmental problems, such as thermal pollution, and have a negative impact on the ecological environment. In terms of low-temperature waste heat power generation technology, although it has the advantage of generating economic benefits without consuming fuel, for example, for cement production enterprises, it can reduce production energy consumption costs, save energy, avoid the heat island phenomenon caused by the direct discharge of waste heat from cement kiln exhaust gas into the atmosphere, and reduce the fuel consumption of other energy enterprises, thereby reducing the emission of combustion wastes such as CO2, which is beneficial to environmental protection.

[0003] However, as an important component of the flash evaporator in this technology, there are many problems with its related calculation methods. On the one hand, the existing calculation methods cannot effectively solve the problem of insufficient waste heat utilization that is common among users. Traditional power generation equipment often easily discharges low-parameter waste heat resources. Although this part of waste heat can be utilized by installing a flash evaporator in the system, due to the limitations of the calculation method, it is still difficult to fully tap its potential, resulting in a relatively serious waste of energy. On the other hand, some users in the market purchase non-standard flash evaporator products with improper parameter selection, unreasonable selection of empirical coefficients and surplus coefficients. This directly leads to poor separation effect of the separator in the flash evaporator, which in turn causes problems such as water and salt accumulation in the turbine blades. Water and salt accumulation in the turbine blades will destroy the dynamic balance of the blades, cause blade corrosion, and ultimately seriously affect the operating stability of the power generation system, shorten the service life of the turbine, increase equipment maintenance costs and operating risks, and restrict the further development and widespread application of low-temperature waste heat power generation technology. Therefore, a more accurate and reasonable flash evaporator calculation method is urgently needed to overcome these problems. Summary of the invention

[0004] The present invention proposes a calculation method for a flash evaporator, which strictly controls key parameters affecting the flash steam generation and the flash evaporator volume, such as the heat dissipation loss of the flash evaporator, the flash steam dryness, and the steam volume load, and ensures that the flash steam heat balance calculation is optimized and the product of the flash steam amount and the enthalpy drop of the flash steam when expanding and doing work in the turbine in the multi-stage flash evaporation setting is maximized. At the same time, the corresponding relationship between the boiling point and pressure of water and the reasonable application of the multi-stage flash evaporation system are considered to improve the comprehensive utilization rate of hot water, thereby solving the problems of insufficient waste heat utilization, poor separation effect of the flash evaporator separator leading to damage of the turbine blades, affecting the stability of the power generation system and the life of the turbine, as well as energy waste and environmental pollution in the prior art.

[0005] A flash evaporator calculation method, the flash steam calculation method comprises the following steps:

[0006] S100, according to the influence of parameters, determine the calculation rules for strictly controlling these parameters within the design requirements, the parameters including the heat dissipation loss of the flash evaporator, the flash steam dryness, the steam volume load on the flash steam generation and the flash evaporator volume;

[0007] S200, with the goal of maximizing the product DΔh of the flash steam volume D and the enthalpy drop Δh when the flash steam expands in the turbine to do work, performing flash steam heat balance calculation optimization and multi-stage flash setting calculation to determine the optimal flash steam parameters;

[0008] S300. Based on the one-to-one correspondence between the boiling point and pressure of water, that is, the higher the pressure, the higher the boiling point, and the lower the pressure, the lower the boiling point, water is allowed to absorb heat and heat up in the heat exchanger for waste heat recovery without vaporizing, and then expands and reduces the pressure in the flash evaporator to generate steam. The relevant parameters in the process are calculated, including the inlet high-temperature hot water / saturated water / condensed water volume D in , Enthalpy of inlet high-temperature hot water / saturated water / condensed water h in , saturated steam enthalpy h1 under flash evaporator working pressure, saturated water enthalpy h2 under flash evaporator working pressure, flash steam dryness x, flash evaporator / tank recommended minimum volume V, flash evaporator / tank volume surplus coefficient K, saturated steam specific volume υ under flash evaporator working pressure, steam volume load r;

[0009] S400, calculate the flash steam volume D by a specific formula, the formula is:

[0010]

[0011] Among them, the surplus coefficient φ and the heat dissipation coefficient η are determined according to the actual system operation conditions and design requirements;

[0012] S500. According to the flash steam parameters and other related parameters determined by the above calculations, the structure and operation parameters of the flash evaporator are designed, including the flash tank inner diameter d, the flash tank volume V and the stage setting of the multi-stage flash evaporation system, wherein the flash tank volume V is calculated and determined based on parameters such as the steam volume load r, the flash evaporator / tank volume surplus coefficient K and the flash steam volume D, the flash tank inner diameter d is calculated and determined based on parameters such as the steam rise speed w and the flash tank volume V, and the stage setting of the multi-stage flash evaporation system follows the principle of making the temperature difference of each stage equal to obtain the best hot water utilization effect.

[0013] Furthermore, the value range of the heat dissipation coefficient η is 0.94-0.992.

[0014] Furthermore, the flash steam quality x ranges from 0.95 to 1.0.

[0015] Furthermore, the steam volume load r ranges from 800 to 1200 m 3 / (m 3 h).

[0016] Furthermore, the value range of the flash evaporator / tank volume surplus coefficient K is 1.2-1.5.

[0017] Furthermore, the number of stages of the multi-stage flash system is determined based on factors such as the temperature and pressure of the waste heat resources and the required power generation, and the number of stages is not less than 2.

[0018] Furthermore, the inlet high temperature hot water / saturated water / condensed water D in The temperature range is 150℃-250℃, and the pressure range is 1.5MPa-2.5MPa.

[0019] Furthermore, when calculating the saturated steam enthalpy h1, saturated water enthalpy h2 and saturated steam specific volume υ under the working pressure of the flash evaporator, the values ​​are queried and taken according to the relevant standards of water and water vapor characteristics to ensure the accuracy and reliability of the calculation parameters.

[0020] A storage medium stores a computer program, which implements the above-mentioned calculation method for a flash evaporator when executed by a processor.

[0021] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the above-mentioned calculation method for a flash evaporator.

[0022] Beneficial effects of the present invention:

[0023] 1. The flash evaporator calculation method of the present invention realizes the effective recovery and utilization of low-quality waste heat resources in traditional energy enterprises. By accurately calculating various parameters in the flash evaporation process, it is ensured that under different pressure and temperature conditions, waste heat can be converted into usable steam to the greatest extent for power generation or other process, thereby significantly reducing the energy waste caused by direct discharge of waste heat in the past. The rational design of the multi-stage flash evaporation system makes the temperature difference of each stage equal, further optimizes the utilization effect of hot water, improves the energy conversion efficiency of the entire waste heat recovery system, and makes energy more fully and reasonably utilized.

[0024] 2. The present invention strictly controls the flash steam dryness and other parameters, ensuring that the steam generated by flash evaporation is of high quality and effectively avoiding the problem of water and salt accumulation on the turbine blades. This helps to maintain the dynamic balance of the turbine blades, reduce blade corrosion, extend the service life of the turbine, and reduce the cost of frequent repairs or replacement of parts due to damage to the equipment. The optimized flash evaporator calculation method ensures that the separator in the flash evaporator has a good separation effect, improves the operating stability of the entire power generation system, reduces downtime caused by equipment failure, improves production efficiency, and indirectly reduces the operating costs of the enterprise.

[0025] 3. The calculation method of this application can be used to design energy-saving equipment with different pressures and temperature parameters. Whether it is the recovery of condensed water in enterprises, the utilization of waste heat from boiler wastewater, the comprehensive utilization of waste heat from metallurgy and cement industries, or geothermal hot spring power generation, the most suitable flash evaporator can be designed according to the specific waste heat conditions and power generation needs, meeting the diverse industrial application scenarios and user needs.

[0026] 4. The flash evaporator calculation method of the present invention provides key technical support for low-temperature waste heat power generation technology, enabling it to operate more stably and efficiently, and is expected to make low-temperature waste heat power generation one of the important supplementary energy sources in my country's future energy structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of flash steam;

[0028] Figure 2 This is the structural detail diagram of the flash evaporator;

[0029] Figure 3 This is the system flow diagram of the system where the flash evaporator is located. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The present invention proposes a flash evaporator calculation method, which comprises the following steps:

[0032] S100, according to the influence of parameters, determine the calculation rules for strictly controlling these parameters within the design requirements, the parameters including the heat dissipation loss of the flash evaporator, the flash steam dryness, the steam volume load on the flash steam generation and the flash evaporator volume;

[0033] S200, with the goal of maximizing the product DΔh of the flash steam volume D and the enthalpy drop Δh when the flash steam expands in the turbine to do work, performing flash steam heat balance calculation optimization and multi-stage flash setting calculation, determining optimal flash steam parameters, and improving the comprehensive utilization rate of hot water;

[0034] S300. Based on the one-to-one correspondence between the boiling point and pressure of water, that is, the higher the pressure, the higher the boiling point, and the lower the pressure, the lower the boiling point, water is allowed to absorb heat and heat up in the heat exchanger for waste heat recovery without vaporizing, and then expands and reduces the pressure in the flash evaporator to generate steam. The relevant parameters in the process are calculated, including the inlet high-temperature hot water / saturated water / condensed water volume D in , Enthalpy of inlet high-temperature hot water / saturated water / condensed water h in , saturated steam enthalpy h1 under flash evaporator working pressure, saturated water enthalpy h2 under flash evaporator working pressure, flash steam dryness x, flash evaporator / tank recommended minimum volume V, flash evaporator / tank volume surplus coefficient K, saturated steam specific volume υ under flash evaporator working pressure, steam volume load r;

[0035] S400, calculate the flash steam volume D by a specific formula, the formula is:

[0036]

[0037] Among them, the surplus coefficient φ and the heat dissipation coefficient η are determined according to the actual system operation conditions and design requirements;

[0038] S500. According to the flash steam parameters and other related parameters determined by the above calculations, the structure and operation parameters of the flash evaporator are designed, including the flash tank inner diameter d, the flash tank volume V and the stage setting of the multi-stage flash evaporation system, wherein the flash tank volume V is calculated and determined based on parameters such as the steam volume load r, the flash evaporator / tank volume surplus coefficient K and the flash steam volume D, the flash tank inner diameter d is calculated and determined based on parameters such as the steam rise speed w and the flash tank volume V, and the stage setting of the multi-stage flash evaporation system follows the principle of making the temperature difference of each stage equal to obtain the best hot water utilization effect.

[0039] Specifically, the present invention determines the calculation rules by comprehensively considering the key factors such as the heat dissipation loss of the flash evaporator, the flash steam dryness, and the steam volume load, and can accurately control these parameters within a reasonable range to ensure that the flash steam volume and the enthalpy drop product are maximized, so as to achieve efficient and comprehensive utilization of hot water. Based on the relationship between the boiling point and pressure of water, the heat exchanger and the flash evaporator are reasonably operated and the relevant parameters are calculated. Combined with specific formulas and the optimization design of the flash evaporator structure and operating parameters, including the setting of the multi-stage flash system stage, the flash evaporator can be flexibly adjusted according to different working conditions and is suitable for a variety of waste heat resource conditions, which greatly improves energy utilization efficiency and reduces energy waste; at the same time, it ensures the quality of flash steam, avoids damage to turbine blades, improves the stability of the power generation system and the life of the turbine, reduces equipment maintenance costs, and provides strong support for enterprises to save energy and reduce consumption and improve economic benefits, promotes the development of low-temperature waste heat power generation technology, and helps optimize energy structure and environmental protection.

[0040] Furthermore, the heat dissipation coefficient η ranges from 0.94 to 0.992, which is used to accurately calculate the heat loss during the flash evaporation process to ensure the accuracy of the flash steam heat balance calculation.

[0041] Specifically, the range of the heat dissipation coefficient η is limited to 0.94-0.992, which can accurately reflect the heat loss during the flash evaporation process, making the calculated parameters such as the flash steam volume closer to the actual operating state. When designing a flash evaporator, based on this precise heat dissipation coefficient value, the insulation measures and material selection of the flash evaporator can be reasonably planned, thereby effectively reducing heat loss and improving energy utilization efficiency. In the entire low-temperature waste heat power generation system, stable heat dissipation coefficient control helps maintain the thermal balance of the system and ensure that each component operates within an appropriate temperature range, thereby improving the overall operating stability and reliability of the system, extending the service life of the equipment, reducing system performance fluctuations and potential failure risks caused by heat dissipation problems, ensuring the long-term stable and efficient operation of the low-temperature waste heat power generation system, achieving maximum energy recovery and utilization, reducing enterprise operating costs, and also making positive contributions to environmental protection.

[0042] Furthermore, the value range of flash steam quality x is 0.95-1.0, so as to ensure that the quality of steam generated by flash evaporation meets the requirements of subsequent steam turbine expansion work and improve power generation efficiency.

[0043] Specifically, the present invention limits the value range of the flash steam dryness x to 0.95-1.0. Within this value range, the steam generated by flash evaporation can be ensured to be of excellent quality, and the liquid water content in the steam can be greatly reduced. In the subsequent expansion and working process of the steam turbine, high-quality steam can effectively avoid the phenomenon of water on the turbine blades and reduce the risk of salt accumulation on the blades, thereby effectively maintaining a good dynamic balance state of the turbine blades, significantly reducing the possibility of blade corrosion, greatly extending the service life of the turbine, reducing the frequency of equipment maintenance and replacement, and reducing maintenance costs. At the same time, a stable supply of high-dryness steam helps to improve the working efficiency of the turbine, thereby improving the power generation power and operating stability of the entire power generation system, and ensuring the continuous and efficient operation of the low-temperature waste heat power generation system.

[0044] Furthermore, the steam volume load r ranges from 800 to 1200 m 3 / (m 3 ·h), this value range can reasonably design the flash evaporator volume while ensuring the flash steam production, thereby improving the working efficiency of the flash evaporator.

[0045] Specifically, the present invention limits the steam volume load r to 800-1200m 3 / (m 3 ·h) value range, this range can ensure that the flash evaporator maintains an appropriate steam holding state per unit time and per unit volume, and effectively balances the relationship between steam generation and the internal space of the flash evaporator. On the one hand, it avoids excessive steam volume load that leads to excessive steam flow rate in the flash evaporator, so that the steam-water separation process can be carried out fully and efficiently, thereby improving the quality of flash steam and ensuring the safe and stable operation of subsequent equipment such as steam turbines; on the other hand, it prevents the flash evaporator from being too large due to too small steam volume load, avoiding unnecessary equipment cost increase and floor space expansion. By accurately controlling the steam volume load within a reasonable range, efficient and economical design and operation of the flash evaporator are achieved, the energy utilization efficiency of the entire low-temperature waste heat power generation system is improved, the construction and operation costs are reduced, the overall performance and adaptability of the system are enhanced, and strong support is provided for the large-scale promotion of low-temperature waste heat power generation technology, which is conducive to promoting sustainable development in the energy field.

[0046] Furthermore, the value range of the flash evaporator / tank volume surplus coefficient K is 1.2-1.5, which is used to reserve a certain margin when designing the flash evaporator volume to adapt to the operating requirements under different working conditions and ensure the stable operation of the flash evaporator.

[0047] Specifically, the present invention stipulates that the value range of the flash evaporator / tank volume surplus coefficient K is 1.2-1.5. Within this value range, the volume design of the flash evaporator can fully consider the operating requirements under various actual working conditions, and provide the necessary margin for system operation. When the waste heat resource parameters fluctuate or the system load changes, sufficient volume surplus can ensure that the flash evaporator can still operate stably, effectively avoiding problems such as excessive pressure in the flash evaporator or incomplete steam-water separation due to sudden increases in steam volume, thereby ensuring the safety and stability of the entire low-temperature waste heat power generation system. At the same time, a reasonable volume surplus coefficient also helps to optimize the initial investment cost of the flash evaporator, avoid waste of resources caused by over-design, and achieve a good balance between equipment cost and operational reliability while meeting the long-term stable operation requirements of the system.

[0048] Furthermore, the number of stages of the multi-stage flash evaporation system is determined based on the temperature, pressure and required power generation of the waste heat resources, and the number of stages is not less than 2, so as to make full use of high-temperature hot water and reduce the irreversible process of flash evaporation. loss and improve circulation efficiency.

[0049] Specifically, in this application, the number of stages is determined based on the temperature, pressure, and required power generation of the waste heat resources and is not less than 2, which enables the multi-stage flash evaporation system to be flexibly and accurately configured according to different actual conditions. On the one hand, by reasonably setting the number of stages, the temperature difference of each stage can be equal, thereby making full use of high-temperature hot water and minimizing the damage caused by the irreversible process of flash evaporation. Loss, effectively improving the efficiency of the entire circulation system, thereby improving the power generation capacity of the low-temperature waste heat power generation system and increasing energy output. On the other hand, this method of customizing the number of stages according to specific working conditions enhances the system's adaptability to a variety of waste heat resources. Regardless of the temperature and pressure range of the waste heat, the most suitable number of stages can be found to achieve efficient energy recovery and utilization, promoting the application of low-temperature waste heat power generation technology in a wider range of scenarios, and helping enterprises to further tap the potential of waste heat resources, reduce production costs, and improve economic benefits.

[0050] Furthermore, the inlet high temperature hot water / saturated water / condensed water D in The temperature range is 150℃-250℃, and the pressure range is 1.5MPa-2.5MPa.

[0051] Specifically, the present invention limits the temperature range of the inlet high-temperature hot water / saturated water / condensed water to 150°C-250°C and the pressure range to 1.5MPa-2.5MPa. This temperature and pressure range covers many common low-temperature waste heat resource conditions, making the flash evaporator calculation method widely applicable. In actual industrial scenarios, a large amount of waste heat resources are within this parameter range, such as the waste heat of medium and low temperature exhaust gas discharged by the metallurgical and cement industries. By accurately designing for this range, it can ensure that the waste heat resources of these industries are effectively recycled and utilized, avoiding the waste of resources caused by mismatched calculation methods. At the same time, the clear temperature and pressure range provides a clear basis for the design and selection of the flash evaporator and the entire waste heat power generation system, which helps to optimize equipment configuration, improve the stability and reliability of the system, reduce the complexity of system design and operation, thereby reducing costs and promoting the large-scale promotion and application of low-temperature waste heat power generation technology in more industries.

[0052] Furthermore, when calculating the saturated steam enthalpy h1, saturated water enthalpy h2 and saturated steam specific volume υ under the working pressure of the flash evaporator, the values ​​are queried and taken according to the relevant standards of water and water vapor characteristics to ensure the accuracy and reliability of the calculation parameters.

[0053] Specifically, this approach of the present invention ensures that the key parameters used in the calculation process have a high degree of accuracy and reliability. Accurate parameter values ​​are the cornerstone of the entire flash evaporator calculation method, making the subsequent flash steam volume, heat balance relationship, and flash evaporator structural design results calculated based on these parameters more accurate. This helps to achieve the optimal design of the flash evaporator, ensure that the flash evaporation process is carried out under precise theoretical guidance, improve the flash evaporation efficiency, and thus improve the energy conversion efficiency of the entire low-temperature waste heat power generation system. At the same time, the standard value selection also enhances the versatility and standardization of the calculation method. Different regions and different enterprises can obtain accurate parameters based on unified and scientific standards when applying this calculation method, which promotes the widespread dissemination and application of technology, lays the foundation for the standardized development of low-temperature waste heat power generation technology, and effectively promotes the popularization and improvement of this technology in the industry.

[0054] A storage medium stores a computer program, which implements the above-mentioned calculation method for a flash evaporator when executed by a processor.

[0055] Specifically, a storage medium stores a computer program that can implement the above-mentioned flash evaporator calculation method, and the storage medium provides a convenient, stable and reusable carrier for the application of the flash evaporator calculation method. By executing the computer program therein through the processor, the flash evaporator related parameters can be calculated quickly and accurately, which greatly improves the calculation efficiency, avoids the errors that may be caused by manual calculation, and ensures the accuracy of the flash evaporator design and operation parameters. This is not only conducive to improving the performance of the flash evaporator itself, realizing the efficient recycling of low-quality waste heat resources, improving energy utilization efficiency and reducing energy waste, but also ensuring the stable operation of the entire low-temperature waste heat power generation system, reducing the risk of system failures caused by inaccurate calculations, extending the service life of equipment, and reducing maintenance costs. At the same time, this storage medium is convenient for the dissemination and use of the calculation method between different devices, which helps to promote the widespread application of low-temperature waste heat power generation technology in various industries, and makes positive contributions to energy structure optimization, enterprise energy conservation and emission reduction, and environmental protection, and promotes sustainable development in the energy field.

[0056] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor. The processor executes the program to implement the above-mentioned calculation method for a flash evaporator.

[0057] Specifically, a computer device includes a memory, a processor and a corresponding computer program to implement a flash evaporator calculation method. The computer device uses the processor to execute the program to realize the automation and efficiency of the flash evaporator calculation, can quickly process complex calculation tasks, greatly shorten the calculation time, and provide accurate data support for engineering design and system operation in a timely manner. Its precise calculation ability ensures the accurate determination of various parameters of the flash evaporator, thereby optimizing the flash evaporator design, maximizing the utilization of low-quality waste heat resources, effectively improving energy recovery efficiency, reducing energy waste, and reducing corporate energy costs. At the same time, stable operation helps to ensure the reliable operation of the entire low-temperature waste heat power generation system, avoid system instability or failure caused by calculation errors, extend the service life of the equipment, and reduce the frequency and cost of equipment maintenance. Furthermore, this computer device provides a standardized and replicable solution for flash evaporator calculation, which is easy to promote and apply in different scenarios, promotes the widespread dissemination and development of low-temperature waste heat power generation technology, and promotes various industries to achieve sustainable development while saving energy and reducing emissions. It has positive and far-reaching significance for optimizing energy structure and protecting the environment.

[0058] The following is a sample data for heat balance calculation of flash system:

[0059]

[0060]

[0061] A calculation method for a flash evaporator of the present invention achieves efficient recovery and utilization of low-quality waste heat resources, reduces energy waste, and improves energy utilization efficiency by accurately controlling parameters such as heat dissipation loss, flash steam dryness, and steam volume load, combined with multi-stage flash evaporation system optimization and standard value selection based on water and water vapor characteristics; effectively avoids problems such as water and salt accumulation on turbine blades, extends the service life of the turbine, reduces equipment maintenance costs, and enhances the stability of the power generation system; the determined value ranges and calculation rules of various parameters enable the flash evaporator to adapt to a variety of waste heat resource conditions, and is widely used in multiple industries, promoting the development of low-temperature waste heat power generation technology; the application of storage media and computer equipment realizes automation and efficiency of calculations, provides convenient and replicable solutions, helps technology promotion, and ultimately promotes energy structure optimization, environmental protection, and sustainable development.

[0062] 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 addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A flash evaporator calculation method, characterized in that: The flash steam calculation method comprises the following steps: S100, determining calculation rules for strictly controlling these parameters within the design requirements according to the influence of the parameters, wherein the parameters include heat dissipation loss of the flash evaporator, flash steam dryness, steam volume load to flash steam generation and flash evaporator volume; S200, with the goal of maximizing the product DΔh of the flash steam volume D and the enthalpy drop Δh when the flash steam expands in the turbine to do work, performing flash steam heat balance calculation optimization and multi-stage flash setting calculation to determine the optimal flash steam parameters; S300, based on the one-to-one correspondence between the boiling point and pressure of water, that is, the higher the pressure, the higher the boiling point, and the lower the pressure, the lower the boiling point, water is made to absorb heat and heat up in the heat exchanger for waste heat recovery without vaporizing, and then expands the volume and reduces the pressure in the flash evaporator to generate steam, and calculates the relevant parameters in the process, which include the inlet high-temperature hot water / saturated water / condensed water volume D in , Enthalpy of inlet high-temperature hot water / saturated water / condensed water h in , saturated steam enthalpy h1 under flash evaporator working pressure, saturated water enthalpy h2 under flash evaporator working pressure, flash steam dryness x, flash evaporator / tank recommended minimum volume V, flash evaporator / tank volume surplus coefficient K, saturated steam specific volume υ under flash evaporator working pressure, steam volume load r; S400, calculating the flash steam amount D by a specific formula, the formula is: Among them, the surplus coefficient φ and the heat dissipation coefficient η are determined according to the actual system operation conditions and design requirements; S500. According to the flash steam parameters and other related parameters determined by the above calculations, the structure and operation parameters of the flash evaporator are designed, including the flash tank inner diameter d, the flash tank volume V and the stage setting of the multi-stage flash evaporation system, wherein the flash tank volume V is calculated and determined based on parameters such as the steam volume load r, the flash evaporator / tank volume surplus coefficient K and the flash steam volume D, the flash tank inner diameter d is calculated and determined based on parameters such as the steam rise speed w and the flash tank volume V, and the stage setting of the multi-stage flash evaporation system follows the principle of making the temperature difference of each stage equal to obtain the best hot water utilization effect.

2. The calculation method of a flash evaporator according to claim 1, characterized in that: The value range of the heat dissipation coefficient η is 0.94-0.

992.

3. The calculation method of a flash evaporator according to claim 2, characterized in that: The flash steam quality x has a value range of 0.95-1.

0.

4. The calculation method of a flash evaporator according to claim 3, characterized in that: The steam volume load r ranges from 800 to 1200 m 3 / (m 3 h).

5. A flash evaporator calculation method according to claim 4, characterized in that: The value range of the flash evaporator / tank volume surplus coefficient K is 1.2-1.

5.

6. A flash evaporator calculation method according to claim 5, characterized in that: The number of stages of the multi-stage flash evaporation system is determined based on factors such as the temperature and pressure of the waste heat resources and the required power generation power, and the number of stages is not less than 2.

7. A flash evaporator calculation method according to claim 6, characterized in that: The inlet high temperature hot water / saturated water / condensed water D in The temperature range is 150℃-250℃, and the pressure range is 1.5MPa-2.5MPa.

8. A flash evaporator calculation method according to claim 7, characterized in that: When calculating the saturated steam enthalpy h1, saturated water enthalpy h2 and saturated steam specific volume υ under the working pressure of the flash evaporator, the values ​​are queried and obtained according to the relevant standards of water and water vapor characteristics to ensure the accuracy and reliability of the calculation parameters.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the calculation method for a flash evaporator according to any one of claims 1 to 8 is implemented.

10. A computer device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a calculation method for a flash evaporator according to any one of claims 1 to 8.

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