Ammonia water preparation control method, device, equipment and program product

Abstract

The invention relates to the field of ammonia water preparation, in particular to a control method, device and equipment for ammonia water preparation and a program product. The method comprises the following steps: obtaining ammonia water preparation concentration of ammonia water to be prepared; determining a first flow of a liquid ammonia input pipeline and a second flow of a water inlet pipeline according to the ammonia water preparation concentration; according to the first flow of the liquid ammonia input pipeline, first heat absorbed when the liquid ammonia is vaporized in the ammonia water preparation box is determined, and second heat generated when ammonia gas is dissolved to generate ammonia water is determined; and determining the water temperature of the water inlet pipeline according to the first heat, the second heat and the preset ammonia water preparation temperature, determining the refrigerant temperature and the refrigerant flow of the cooling device, and preparing the ammonia water according to the determined water temperature, the refrigerant temperature and the refrigerant flow of the water inlet pipeline. According to the method, more accurate temperature control can be realized in the ammonia water preparation process, so that the purity of the prepared ammonia water is improved, and the ammonia water preparation efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of ammonia preparation, and in particular to a control method, device, equipment and program product for ammonia preparation. Background Art

[0002] Ammonia, a solution of ammonia gas dissolved in water, is a colorless alkaline liquid with a pungent odor. It has a wide range of applications in many fields. For example, ammonia can be used as an agricultural fertilizer to provide nitrogen sources to promote crop growth; it can be used in industry to treat waste gas; and in the textile industry to process wool and other fibers. Due to its versatility, ammonia has become a chemical with important uses in industry and agriculture.

[0003] When preparing ammonia water, heat is generated in the process of ammonia gas dissolving in water, causing the temperature in the ammonia water preparation box to rise. Although the temperature of the ammonia water preparation box can be adjusted by cooling equipment, such as through PID control, it is not conducive to improving the production efficiency and purity of ammonia water due to factors such as the effectiveness of the temperature detection position. Summary of the invention

[0004] In view of this, the embodiments of the present application provide methods, devices, equipment and program products to solve the problem in the prior art that the effectiveness of temperature detection is affected, which is not conducive to improving the production efficiency of ammonia preparation and the purity of ammonia.

[0005] A first aspect of an embodiment of the present application provides a control method for preparing ammonia water, wherein the equipment for preparing ammonia water comprises an ammonia water preparation box, a liquid ammonia input pipeline, a water inlet pipeline, a mixing device, a cooling device, an ammonia water outlet and a controller, wherein the liquid ammonia input pipeline is used to input liquid ammonia into the ammonia water preparation box, and vaporize the liquid ammonia in the ammonia water preparation box to generate ammonia gas, the water inlet pipeline is used to inject water for mixing into the ammonia water preparation box, the mixing device is used to mix the ammonia gas and the water to generate ammonia water, the cooling device is used to reduce the heat in the ammonia water production box, and the controller is used to control the equipment to prepare ammonia water according to the method, and the method comprises:

[0006] Obtaining the ammonia concentration of the ammonia water to be prepared;

[0007] Determine a first flow rate of the liquid ammonia input pipeline and a second flow rate of the water inlet pipeline according to the prepared ammonia water concentration;

[0008] Determine, according to the first flow rate of the liquid ammonia input pipeline, a first amount of heat absorbed by the liquid ammonia when vaporizing in the ammonia water preparation tank, and determine a second amount of heat generated by the ammonia gas dissolving to generate ammonia water;

[0009] Based on the first heat and the second heat, combined with the preset ammonia water preparation temperature, the water temperature of the water inlet pipe, as well as the refrigerant temperature and refrigerant flow of the cooling device are determined, and ammonia water is prepared according to the determined water temperature of the water inlet pipe, the refrigerant temperature and the refrigerant flow.

[0010] In combination with the first aspect, in a first possible implementation of the first aspect, determining the water temperature of the water inlet pipe and determining the refrigerant temperature and refrigerant flow rate of the cooling device according to the first heat, the second heat, and a preset ammonia water preparation temperature includes:

[0011] Determining a heat difference in the ammonia water preparation tank according to the first heat and the second heat;

[0012] Determining a temperature change of the aqueous ammonia due to the heat difference according to the first flow rate, the second flow rate, and the heat difference;

[0013] The water temperature of the water inlet pipe is determined according to the temperature change and the ammonia water preparation temperature, and the refrigerant temperature and refrigerant flow rate of the cooling device are determined.

[0014] In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, determining the water temperature of the water inlet pipe according to the temperature change and the ammonia water preparation temperature, and determining the refrigerant temperature and refrigerant flow rate of the cooling device include:

[0015] When the temperature change is less than a predetermined temperature threshold, determining the water temperature of the water inlet pipe according to the ammonia water preparation temperature and the temperature change, and turning off the cooling device;

[0016] When the temperature change is greater than or equal to a predetermined temperature threshold, the temperature of the water inlet pipe is determined to be a preset first temperature, and the cooling device is turned on. The refrigerant temperature and refrigerant flow of the cooling device are determined based on the difference between the ammonia preparation temperature and the first temperature combined with the second flow.

[0017] In combination with the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, determining the refrigerant temperature and the refrigerant flow rate of the cooling device according to the difference between the ammonia water preparation temperature and the first temperature in combination with the second flow rate includes:

[0018] Determine a third amount of heat according to the difference between the ammonia water preparation temperature and the first temperature in combination with the second flow rate;

[0019] The refrigerant temperature and the refrigerant flow rate of the cooling device are determined according to the third heat amount.

[0020] In combination with the first aspect, in a fourth possible implementation manner of the first aspect, the mixing device further includes a first spray pipe and a second spray pipe, the first spray pipe is connected to the liquid ammonia input pipe, the second spray pipe is connected to the water inlet pipe, the first spray pipe and the second spray pipe are arranged in the ammonia water preparation box, and the first spray pipe is arranged at a lower part of the second spray pipe;

[0021] After determining the first flow rate of the liquid ammonia input pipeline and the second flow rate of the water inlet pipeline according to the prepared ammonia water concentration, the method further includes:

[0022] The opening of the first valve of the spray port of the first spray pipe is controlled according to the first flow rate to spray, and the opening of the second valve of the spray port of the second spray pipe is controlled according to the second flow rate to spray.

[0023] In combination with the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the mixing device further includes a packing layer, the packing layer is arranged below the second spray pipe, and the first spray pipe is located in the packing layer, or below the packing layer;

[0024] The equipment for preparing ammonia water also includes an ammonia recycling pipeline, the air inlet of the ammonia recycling pipeline is arranged on the top of the ammonia water preparation box, and the air outlet of the ammonia recycling pipeline is arranged in the packing layer, or is located below the packing layer.

[0025] In combination with the first aspect, in a sixth possible implementation of the first aspect, the cooling device includes a cooling pipe, the mixing device includes a mixing spray pipe, the mixing spray pipe is connected to the liquid ammonia input pipe and the water inlet pipe, the mixing spray pipe and the cooling pipe are coaxial pipes, and the cooling pipe is located inside the mixing spray pipe.

[0026] A second aspect of an embodiment of the present application provides a control device for preparing ammonia water, wherein the equipment for preparing ammonia water comprises an ammonia water preparation box, a liquid ammonia input pipeline, a water inlet pipeline, a mixing device, a cooling device, an ammonia water outlet and a controller, wherein the liquid ammonia input pipeline is used to input liquid ammonia into the ammonia water preparation box, and vaporize the liquid ammonia in the ammonia water preparation box to generate ammonia gas, the water inlet pipeline is used to inject water for mixing into the ammonia water preparation box, the mixing device is used to mix the ammonia gas and the water to generate ammonia water, the cooling device is used to reduce the heat in the ammonia water production box, and the controller is used to control the equipment to prepare ammonia water according to the device, and the device comprises:

[0027] An ammonia water preparation concentration acquisition unit, used to acquire the ammonia water preparation concentration of the ammonia water to be prepared;

[0028] A flow determination unit, used to determine a first flow of the liquid ammonia input pipeline and a second flow of the water inlet pipeline according to the prepared ammonia water concentration;

[0029] a heat determination unit, for determining, according to a first flow rate of the liquid ammonia input pipeline, a first heat absorbed by the liquid ammonia when vaporizing in the ammonia water preparation tank, and a second heat generated by the ammonia gas dissolving to generate ammonia water;

[0030] The ammonia water preparation unit is used to determine the water temperature of the water inlet pipe and the refrigerant temperature and refrigerant flow of the cooling device according to the first heat, the second heat and a preset ammonia water preparation temperature, and prepare ammonia water according to the determined water temperature of the water inlet pipe, the refrigerant temperature and the refrigerant flow.

[0031] A third aspect of an embodiment of the present application provides a control device for gas-water preparation, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the control device for gas-water preparation implements a method as described in any one of the first aspects.

[0032] A fourth aspect of the embodiments of the present application provides a computer program product, which, when executed on a computer, enables the computer to execute the method in the first aspect or its various implementations.

[0033] A fifth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described in any one of the first aspects are implemented.

[0034] The sixth aspect of the embodiment of the present application provides a chip for implementing the methods in each implementation of the first aspect. Specifically, the chip includes: a processor for calling and running a computer program from a memory, so that a device equipped with the chip executes the method in the first aspect or its implementation.

[0035] Compared with the prior art, the embodiments of the present application have the following beneficial effects: when preparing ammonia water, the embodiments of the present application input liquid ammonia into the ammonia water preparation box through the liquid ammonia input pipe and vaporize to generate ammonia gas, inject water into the ammonia water preparation box through the water inlet pipe, mix water through the mixing device to generate ammonia water, determine the first flow rate of the liquid ammonia input pipe and the second flow rate of the water inlet pipe based on the ammonia water preparation concentration, determine the first heat absorbed in the ammonia water preparation box according to the first flow rate, and determine the second heat generated by the dissolution of ammonia gas, determine the water temperature of the water inlet pipe according to the first heat and the second heat, and determine the refrigerant temperature and refrigerant flow of the cooling device in combination with the preset ammonia water preparation temperature, so as to achieve more precise temperature control in the ammonia water preparation process, thereby improving the purity of the prepared ammonia water and improving the ammonia water preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0037] Figure 1 is a schematic diagram of an ammonia water preparation device provided in an embodiment of the present application;

[0038] Figure 2 It is a schematic diagram of the implementation flow of a control method for preparing ammonia water provided in an embodiment of the present application;

[0039] Figure 3 This is a schematic diagram of an implementation flow of determining a control amount provided in an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of another ammonia water preparation device provided in an embodiment of the present application;

[0041] Figure 5 is a schematic diagram of another ammonia water preparation device provided in an embodiment of the present application;

[0042] Figure 6 This is a schematic diagram of a coaxial arrangement of a cooling pipe and a mixing spray pipe provided in an embodiment of the present application;

[0043] Figure 7 is a schematic diagram of a control device for preparing ammonia water provided in an embodiment of the present application;

[0044] Figure 8 It is a schematic diagram of a control device for gas-water preparation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0046] In order to illustrate the technical solution described in this application, a specific embodiment is provided below for illustration.

[0047] Ammonia water is a product widely used in industry and life, and its purity control is of great significance. For example, ammonia water is used as an alkaline disinfectant to disinfect sarin-type poisons, or to stimulate reflexes of breathing and circulation, treat fainting and syncope, and is used as a skin irritant and disinfectant. The common concentration is 10%. The concentration of agricultural ammonia water is usually 15%-18%. In wool spinning, silk, printing and dyeing industries, it is used to wash wool, woolen cloth, grey cloth, dissolve and adjust the pH value. The concentration of ammonia water is usually 25%-28%. Therefore, in the process of preparing ammonia water, it is of great significance to prepare ammonia water with an accurate concentration, that is, high-purity ammonia water.

[0048] In the process of preparing ammonia water, a lot of heat is generated when ammonia gas dissolves in water to generate ammonia water. The increase in temperature will affect the efficiency of ammonia water dissolution, which is not conducive to accurately obtaining the required ammonia water concentration. Although the mixing temperature can be adjusted by setting a thermometer in the ammonia water equipment box, the accuracy of temperature detection is affected by factors such as the detection position, which is not conducive to achieving more uniform and effective temperature control, and is therefore not conducive to improving the production efficiency and purity of ammonia water.

[0049] To solve the above problems, the present invention provides a device for preparing ammonia water, such as Figure 1 The figure shows a schematic diagram of the ammonia water preparation device for preparing ammonia water, i.e., a schematic diagram of the ammonia water preparation device, which includes an ammonia water preparation box 1, a liquid ammonia input pipeline 2, a water inlet pipeline 3, a mixing device 4, a cooling device (not shown in the figure), an ammonia water outlet 5 and a controller (not shown in the figure), wherein liquid ammonia can enter the ammonia water preparation box 1 through the liquid ammonia input pipeline 2 to vaporize to obtain ammonia gas, and is mixed with water injected from the water inlet pipeline 3 through the mixing device 4 to generate ammonia water. The mixing device 4 is Figure 1The diagram shows a first spray pipe 41 and a second spray pipe 42, wherein the first spray pipe 41 is used to spray liquid ammonia to the ammonia water preparation box, and the second spray pipe 42 is used to spray water provided by the water inlet pipe for mixing with ammonia gas. The first spray pipe 41 is located below the second spray pipe 42, and the liquid ammonia sprayed by the first spray pipe 41 rises after vaporization and intersects with the water mist sprayed by the second spray pipe 42, so that the ammonia gas is effectively dissolved in water, and the obtained ammonia water falls into the bottom of the ammonia water preparation box, and the prepared ammonia water can be taken out through the ammonia water outlet 5. The first spray pipe 41 and the second spray pipe 42 can be respectively provided with multiple spray ports to form a larger spraying area.

[0050] Not limited to this structure, the mixing device 4 can also be a mixing spray pipe, which is connected to the liquid ammonia input pipe 2 and the water inlet pipe 3. Liquid ammonia and water are mixed through the mixing spray pipe to obtain ammonia water with a certain concentration. After spraying, the liquid ammonia can be further vaporized and dissolved in water.

[0051] The cooling device can be used to lower the mixing temperature of the mixing device 4, and the controller is used to produce ammonia water according to the control method of ammonia water preparation in the embodiment of the present application, including controlling the water inlet temperature of the water inlet pipe 3, the refrigerant flow rate of the cooling device, the refrigerant temperature and the second flow rate of the water inlet pipe 3, the first flow rate of the liquid ammonia input pipe 2, etc., so as to more accurately control the temperature of the ammonia water preparation and improve the efficiency and purity of the ammonia water preparation.

[0052] Figure 2 A schematic diagram of a control method for preparing ammonia water provided in an embodiment of the present application is described in detail as follows:

[0053] In S201, the ammonia concentration of the ammonia water to be prepared is obtained.

[0054] When receiving an ammonia preparation task, the embodiment of the present application can obtain the preparation concentration of the ammonia preparation task according to the task information in the ammonia preparation task. For example, the ammonia concentration of the ammonia to be prepared can be 5%, 10%, 20%, 30%, etc.

[0055] The concentration of ammonia water can be the mass concentration of ammonia water, which refers to the mass proportion of ammonia (NH3) in ammonia water. It is not limited to mass concentration, but can also be molar concentration, etc. The corresponding control method can be determined according to different types of concentrations, including flow control, temperature control, etc.

[0056] In S202, a first flow rate of the liquid ammonia input pipeline and a second flow rate of the water inlet pipeline are determined according to the prepared ammonia water concentration.

[0057] The mass of ammonia and the mass of water included in the unit mass can be determined according to the concentration of the prepared ammonia water. For example, if the concentration of the prepared ammonia water is the mass concentration, and the concentration is 15%, the mass proportion of ammonia in the ammonia water is 15%, and the mass proportion of water is 85%.

[0058] When determining the first flow rate of the liquid ammonia input pipeline and the second flow rate of the water inlet pipeline, the first flow rate can be determined according to the size of the spray port of the first spray pipeline connected to the liquid ammonia input pipeline, or the second flow rate can be determined according to the size of the spray port of the second spray pipeline connected to the water inlet pipeline. After determining one of the flow rates, the other flow rate can be determined according to the mass ratio of ammonia to water.

[0059] For example, when the concentration of ammonia water is 15%, the first flow rate of the liquid ammonia input pipeline is determined to be 100 kg / h by the size of the spray port of the first spray pipeline (the opening of the spray port of the first spray pipeline can achieve a liquid ammonia spray intensity that meets the predetermined intensity requirement at this flow rate), and the second flow rate of the water inlet pipeline is 567 kg / h according to the mass ratio of ammonia to water. The opening of the second valve of the spray hole of the second spray pipeline connected to the water inlet pipeline can be adjusted according to the size of the second flow rate of the water inlet pipeline determined, for example, the opening of the second valve is adjusted to 80%, so that the water of the second flow rate can be atomized or meet the predetermined spray intensity requirement when spraying to the ammonia water preparation box.

[0060] Alternatively, when the concentration of ammonia water is 15%, the second flow rate of the water inlet pipe is determined to be 567 kg / h by the size of the spray port of the second spray pipe (the opening of the spray port of the second spray pipe can achieve the water spray intensity meeting the predetermined intensity requirement at this flow rate), and the first flow rate of the liquid ammonia input pipe is determined to be 100 kg / h according to the mass ratio of ammonia to water. The opening of the first valve of the spray port of the first spray pipe connected to the liquid nitrogen input pipe can be adjusted according to the size of the determined first flow rate, for example, the opening of the first valve is adjusted to 60%, so that the first flow rate of liquid ammonia meets the predetermined spray intensity when sprayed at the spray port of the first spray pipe.

[0061] In a possible implementation, the first flow rate or the second flow rate can also be determined according to the preparation efficiency in the liquid ammonia preparation box, and the second flow rate or the first flow rate can be determined accordingly according to the first flow rate or the second flow rate and the mass ratio of the two. Then, according to the determined first flow rate and second flow rate, the opening of the first valve of the spray port of the first spray pipe and the opening of the second valve of the spray port of the second spray pipe are adjusted respectively, so that the sprayed liquid ammonia and water reach a predetermined spray intensity, the vaporized ammonia gas and water are mixed more evenly, and the dissolution efficiency is improved.

[0062] In S203, based on the first flow rate of the liquid ammonia input pipeline, the first heat absorbed by the liquid ammonia when vaporizing in the ammonia water preparation tank is determined, and the second heat generated by the ammonia gas dissolving to generate ammonia water is determined.

[0063] The mass of liquid ammonia flowing into the ammonia water preparation tank per unit time can be determined according to the first flow rate of the liquid ammonia input pipeline. The heat absorbed per unit time when the liquid ammonia at the first flow rate is vaporized can be determined according to the mass of the liquid ammonia and the latent heat of vaporization of the liquid ammonia, that is, the heat absorbed when the liquid ammonia turns from liquid to gaseous state.

[0064] Accordingly, the mass of the vaporized ammonia can be determined according to the first flow rate, and the heat generated by the dissolution of the ammonia after the first flow rate of liquid ammonia is vaporized can be determined according to the mass of the ammonia and the heat of solution of the ammonia.

[0065] For example, when the first flow rate is 100 kg / h, the mass of liquid ammonia flowing into the ammonia water preparation tank per unit time, such as one hour, is 100 kg.

[0066] In order to determine the amount of heat required to be absorbed when 100kg of liquid ammonia is vaporized, the latent heat of vaporization of liquid ammonia can be determined first, that is, the amount of heat absorbed when liquid ammonia changes from liquid to gas. If the latent heat of vaporization is determined to be approximately 1336.97 kJ / kg, then the first amount of heat absorbed by the vaporization of 100kg of liquid ammonia is 133697 KJ.

[0067] If the heat of solution of ammonia is determined to be 2166.7 kJ / kg, the second heat generated by dissolving 100 kg of ammonia is: Q = 100 kg * 2166.7 kJ / kg = 216670 KJ.

[0068] Therefore, through the above calculation and comparison, it can be known that according to the above set flow rate, under the condition of sufficient vaporization, the heat generated in the ammonia water preparation box within one hour is the heat difference between the second heat and the first heat. The greater the heat difference, the greater the impact on the temperature in the ammonia water preparation box.

[0069] In S204, the water temperature of the water inlet pipe and the refrigerant temperature and flow rate of the cooling device are determined according to the first heat and the second heat in combination with the preset ammonia water preparation temperature.

[0070] The heat difference in the ammonia water preparation box can be determined based on the first heat and the second heat. If the first heat and the second heat are the heat per unit time, the heat added in the ammonia water preparation box per unit time can be determined to be the heat difference.

[0071] In the embodiment of the present application, the water temperature of the water inlet pipe, the refrigerant temperature of the cooling device and the refrigerant flow rate can be determined based on the heat difference between the first heat and the second heat, combined with the preset ammonia preparation temperature, such as setting the optimal ammonia equipment temperature to 25°C, so as to achieve efficient and high-purity preparation of ammonia. The process of determining the control amount can be as follows: Figure 3 As shown, including:

[0072] In S301, a heat difference in the ammonia water preparation tank is determined according to the first heat amount and the second heat amount.

[0073] According to the first heat absorbed by the first flow of liquid ammonia determined during vaporization within a unit time or a predetermined time, and the second heat released when the vaporized ammonia gas is dissolved in water to generate ammonia water, and the vaporization of liquid ammonia and the dissolution of ammonia gas are located in the same space, the first heat absorbed by vaporization can be used to cool the dissolution process, so as to reduce the heat generated during the preparation of ammonia water and improve the safety of the preparation of ammonia water. The heat difference between the first heat and the second heat is the heat added in the ammonia water preparation box within a unit time or a predetermined time.

[0074] In S302, the temperature change of the ammonia water caused by the heat difference is determined according to the first flow rate, the second flow rate and the heat difference.

[0075] After determining the heat difference per unit time or a predetermined period of time, the amount of water intake per unit time or a predetermined period of time can be determined according to the second flow rate, and the amount of ammonia per unit time or a predetermined period of time can be determined according to the first flow rate. Combined with the specific heat capacity of water and the specific heat capacity of ammonia, the temperature change of ammonia water caused by the heat difference can be determined.

[0076] For example, the temperature change is △T, the specific heat capacity of ammonia is C1, the specific heat capacity of water is C2, the mass of ammonia flowing into the ammonia water preparation box is determined to be m1, the mass of water is m2, and the heat difference is △Q, then △Q = m1*C1*△T+m2*C2*△T. The temperature change △T can be determined according to this formula.

[0077] In S303, the water temperature of the water inlet pipe is determined according to the temperature change and the ammonia water preparation temperature, and the refrigerant temperature and refrigerant flow rate of the cooling device are determined.

[0078] When determining the water temperature of the water inlet pipe according to the temperature change, it can be divided into two cases:

[0079] The first case: if the temperature change is less than the predetermined temperature threshold, the water inlet temperature of the water inlet pipe can be adjusted. By setting the water inlet temperature to a lower temperature, the heat generated during the ammonia dissolution process can preheat the water in the water inlet pipe, so that the heated water temperature rises, and the heat generated during the mixing process makes the temperature of the mixing environment close to the ammonia preparation temperature. Since the control of the water inlet temperature can reduce the temperature, the cooling device can be turned off at this time.

[0080] The temperature threshold is related to the concentration of the ammonia water to be prepared. The higher the concentration of the ammonia water, the smaller the temperature threshold. For example, if the ammonia water preparation temperature is 25°C, the temperature threshold can be set to 20°C for ammonia water with a concentration of 5%, and the temperature threshold can be set to 18°C ​​for ammonia water with a concentration of 10%.

[0081] The second case: If the temperature change is greater than or equal to the predetermined temperature threshold, the temperature of the water inlet pipe can be determined to be the preset first temperature, such as setting the first temperature to 5°C. At this time, the water in the water inlet pipe fails to effectively absorb the heat generated during the dissolution of ammonia gas, and the cooling device needs to be turned on to cool down the mixed environment in the ammonia water preparation box. At this time, the refrigerant temperature and refrigerant flow rate can be determined based on the ammonia water preparation temperature, the first temperature, and the second flow rate.

[0082] Among them, when the refrigerant temperature and refrigerant flow rate are determined according to the ammonia water preparation temperature, the first temperature, and the second flow rate, the third amount of heat that the water can absorb within a unit time or a predetermined duration can be determined according to the difference between the ammonia water preparation temperature and the first temperature. According to the heat difference determined by the first heat and the second heat, combined with the third heat, that is, the difference between the heat difference and the third heat, the heat that needs to be taken away by the cooling device within a unit time or a predetermined duration can be determined. The refrigerant temperature and refrigerant flow rate of the cooling device can be determined according to the heat transfer efficiency of the cooling device at different refrigerant temperatures and the heat that the cooling device needs to take away. Among them, the refrigerant flow rate and the refrigerant temperature can be adjusted adaptively, for example, the refrigerant temperature can be increased when the refrigerant flow rate is increased, and the refrigerant temperature can be reduced when the refrigerant flow rate is reduced.

[0083] The refrigerant may be cooling water or other cooling medium.

[0084] In the examples of the present application, in order to further optimize the preparation efficiency of ammonia water, Figure 4 As shown, the mixing device 4 of the ammonia water preparation equipment also includes a packing layer 43, and the packing of the packing layer 43 can be a bulk packing, a structured packing or a filamentary packing. The bulk packing can include, for example, Raschig rings, ball rings, step rings, etc. The structured packing can include, for example, a mesh corrugated packing or a plate corrugated packing.

[0085] The first spray pipe 41 can be arranged in the packing layer, or below the packing layer, and the second spray pipe 42 can be arranged above the packing layer 43. After the liquid ammonia sprayed from the first spray pipe 41 is vaporized, it can contact with the water mist or water droplets below in the packing layer 43, and the gas-liquid contact area is increased through the packing layer 43, thereby improving the mass transfer efficiency between ammonia and water, so that the ammonia is more fully dissolved in the water.

[0086] In possible implementations, such as Figure 5 As shown, the ammonia water preparation equipment may further include an ammonia recycling pipeline 6. The air inlet of the ammonia recycling pipeline 6 may be arranged at the top of the ammonia water preparation box 1. After the ammonia gas contacts with water, part of the undissolved ammonia gas rises to the top of the ammonia water preparation box 1. The ammonia gas is pumped to the bottom of the ammonia water preparation box 1, or to any position below the packing layer 43 in the ammonia water preparation box 1, or to the packing layer 43, through the power equipment such as the blower in the ammonia recycling pipeline 6. The ammonia gas can contact with water again and dissolve in water to obtain ammonia water.

[0087] In possible implementations, such as Figure 6 The schematic diagram of a coaxial arrangement of a cooling pipe and a mixing spray pipe provided in an embodiment of the present application is shown. The cooling device in the embodiment of the present application includes a cooling pipe 7, and the mixing device 4 includes a mixing spray pipe 44. The mixing spray pipe 44 is connected to the liquid ammonia input pipe 2 and the water inlet pipe 3. The cooling pipe 7 and the mixing spray pipe 44 are coaxial pipes, and the cooling pipe 7 is located inside the mixing spray pipe 44. When the liquid ammonia in the liquid ammonia input pipe is mixed with water, the liquid ammonia dissolves in the water and releases heat, and exchanges heat with the refrigerant in the cooling pipe, which can efficiently generate heat when generating ammonia water. The mixed liquid can be sprayed to the ammonia preparation tank through the spray port 441.

[0088] In the embodiment of the present application, liquid ammonia is input into an ammonia water preparation box through a liquid ammonia input pipe, and ammonia gas is generated by vaporization. Water is injected into the ammonia water preparation box through a water inlet pipe, and ammonia water is generated by mixing through a mixing device. A first flow rate of the liquid ammonia input pipe and a second flow rate of the water inlet pipe are determined based on the ammonia water preparation concentration. A first amount of heat absorbed in the ammonia water preparation box and a second amount of heat generated by the dissolution of ammonia gas are determined according to the first flow rates. The water temperature of the water inlet pipe and the refrigerant temperature and the refrigerant flow rate of the cooling device are determined according to the first and second amounts of heat in combination with a pre-set ammonia water preparation temperature, so as to achieve more precise temperature control during the ammonia water preparation process, thereby improving the purity of the prepared ammonia water and improving the ammonia water preparation efficiency.

[0089] Different temperature adjustment methods are used according to the difference in heat released by ammonia water of different concentrations. For cooling requirements with less heat, the water temperature of the water inlet pipe can be used for cooling adjustment, which can effectively improve the cooling efficiency. For cooling requirements with greater heat, the water inlet pipe and the cooling device can be used for combined cooling, or the cooling device can be used for cooling alone to achieve precise control of the preparation environment in the ammonia preparation box.

[0090] By adjusting the opening of the first valve and the second valve of the spray port, the spray intensity can be effectively adjusted, which is beneficial to maintaining the spray intensity, thereby being able to adapt to the preparation requirements of ammonia water of different concentrations and ensuring the ammonia water preparation efficiency during different ammonia water preparations.

[0091] By setting up the ammonia recycling pipeline, the ammonia gas at the top of the ammonia water preparation box can be in contact with water again, thereby effectively improving the purity of ammonia water during preparation. In addition, by mixing liquid ammonia and water in the mixing spray pipeline and setting up a coaxial cooling pipeline, the cooling efficiency can be effectively improved and the purity of ammonia water preparation can be improved.

[0092] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0093] Figure 7 A schematic diagram of a control device for preparing ammonia water provided in an embodiment of the present application, wherein the device for preparing ammonia water comprises an ammonia water preparation box, a liquid ammonia input pipeline, a water inlet pipeline, a mixing device, a cooling device, an ammonia water outlet and a controller, wherein the liquid ammonia input pipeline is used to input liquid ammonia into the ammonia water preparation box, and vaporize it in the ammonia water preparation box to generate ammonia gas, the water inlet pipeline is used to inject water for mixing into the ammonia water preparation box, the mixing device is used to mix the ammonia gas and the water to generate ammonia water, the cooling device is used to reduce the heat in the ammonia water production box, the controller is used to control the device to prepare ammonia water according to the method, and the device comprises:

[0094] An ammonia water preparation concentration acquisition unit 701 is used to acquire the ammonia water preparation concentration of the ammonia water to be prepared;

[0095] A flow determination unit 702, configured to determine a first flow of the liquid ammonia input pipeline and a second flow of the water inlet pipeline according to the prepared ammonia water concentration;

[0096] The heat determination unit 703 is used to determine the first heat absorbed by the liquid ammonia when it is vaporized in the ammonia water preparation tank, and to determine the second heat generated by the ammonia gas dissolving to generate ammonia water according to the first flow rate of the liquid ammonia input pipeline;

[0097] The ammonia water preparation unit 704 is used to determine the water temperature of the water inlet pipe and the refrigerant temperature and refrigerant flow of the cooling device based on the first heat, the second heat and a preset ammonia water preparation temperature, and prepare ammonia water based on the determined water temperature of the water inlet pipe, the refrigerant temperature and the refrigerant flow.

[0098] Figure 7 The control device for preparing ammonia water shown in FIG. Figure 2 The control method for preparing ammonia water corresponds to that shown.

[0099] Figure 8 Schematic diagram of a control device for gas-water preparation provided in an embodiment of the present application. Figure 8 As shown, the control device 8 for gas-water preparation in this embodiment includes: a processor 80, a memory 81, and a computer program 82 stored in the memory 81 and executable on the processor 80, such as a control program for ammonia water preparation. When the processor 80 executes the computer program 82, the steps in the above-mentioned control method embodiments for ammonia water preparation are implemented. Alternatively, when the processor 80 executes the computer program 82, the functions of the modules / units in the above-mentioned device embodiments are implemented.

[0100] Exemplarily, the computer program 82 may be divided into one or more modules / units, which are stored in the memory 81 and executed by the processor 80 to complete the present application. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 82 in the control device 8 for gas-water preparation.

[0101] The control device 8 for gas-water preparation can be a computing device such as a desktop computer, a notebook, a PDA, or a cloud server. The control device for gas-water preparation can include, but is not limited to, a processor 80 and a memory 81. Those skilled in the art can understand that Figure 8 It is only an example of a control device 8 for gas-water preparation and does not constitute a limitation of the control device 8 for gas-water preparation. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the control device for gas-water preparation may also include input and output devices, network access devices, buses, etc.

[0102] The processor 80 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0103] The memory 81 may be an internal storage unit of the control device 8 for gas-water preparation, such as a hard disk or memory of the control device 8 for gas-water preparation. The memory 81 may also be an external storage device of the control device 8 for gas-water preparation, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the control device 8 for gas-water preparation. Further, the memory 81 may also include both an internal storage unit and an external storage device of the control device 8 for gas-water preparation. The memory 81 is used to store the computer program and other programs and data required by the control device for gas-water preparation. The memory 81 may also be used to temporarily store data that has been output or is to be output.

[0104] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0105] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0106] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0107] In the embodiments provided in the present application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0108] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0109] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0110] If the integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, and can also be completed by hardware related to computer program instructions. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0111] In addition, an embodiment of the present application also provides a computer program product, which, when executed on a computer, enables the computer to execute the methods in the above-mentioned implementation modes.

[0112] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person 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. Such 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 application, and should all be included in the protection scope of the present application.

Claims

1. A control method for preparing ammonia water, characterized in that: The equipment for preparing ammonia water comprises an ammonia water preparation box, a liquid ammonia input pipeline, a water inlet pipeline, a mixing device, a cooling device, an ammonia water outlet and a controller, wherein the liquid ammonia input pipeline is used to input liquid ammonia into the ammonia water preparation box, and the liquid ammonia is vaporized in the ammonia water preparation box to generate ammonia gas, the water inlet pipeline is used to inject water for mixing into the ammonia water preparation box, the mixing device is used to mix the ammonia gas and the water to generate ammonia water, the cooling device is used to reduce the heat in the ammonia water production box, and the controller is used to control the equipment to prepare ammonia water according to the method, and the method comprises: Obtaining the ammonia concentration of the ammonia water to be prepared; Determine a first flow rate of the liquid ammonia input pipeline and a second flow rate of the water inlet pipeline according to the prepared ammonia water concentration; Determine, according to the first flow rate of the liquid ammonia input pipeline, a first amount of heat absorbed by the liquid ammonia when vaporizing in the ammonia water preparation tank, and determine a second amount of heat generated by the ammonia gas dissolving to generate ammonia water; Based on the first heat and the second heat, combined with the preset ammonia water preparation temperature, the water temperature of the water inlet pipe, as well as the refrigerant temperature and refrigerant flow of the cooling device are determined, and ammonia water is prepared according to the determined water temperature of the water inlet pipe, the refrigerant temperature and the refrigerant flow.

2. The method according to claim 1, characterized in that According to the first heat amount and the second heat amount, combined with the preset ammonia water preparation temperature, the water temperature of the water inlet pipe is determined, and the refrigerant temperature and refrigerant flow rate of the cooling device are determined, including: Determining a heat difference in the ammonia water preparation tank according to the first heat and the second heat; Determining a temperature change of the aqueous ammonia due to the heat difference according to the first flow rate, the second flow rate, and the heat difference; The water temperature of the water inlet pipe is determined according to the temperature change and the ammonia water preparation temperature, and the refrigerant temperature and refrigerant flow rate of the cooling device are determined.

3. The method according to claim 2, characterized in that Determining the water temperature of the water inlet pipe according to the temperature change and the ammonia water preparation temperature, and determining the refrigerant temperature and refrigerant flow rate of the cooling device, including: When the temperature change is less than a predetermined temperature threshold, determining the water temperature of the water inlet pipe according to the ammonia water preparation temperature and the temperature change, and turning off the cooling device; When the temperature change is greater than or equal to a predetermined temperature threshold, the temperature of the water inlet pipe is determined to be a preset first temperature, and the cooling device is turned on. The refrigerant temperature and refrigerant flow of the cooling device are determined based on the difference between the ammonia preparation temperature and the first temperature combined with the second flow.

4. The method according to claim 3, characterized in that Determining the refrigerant temperature and refrigerant flow rate of the cooling device according to the difference between the ammonia water preparation temperature and the first temperature in combination with the second flow rate includes: Determine a third amount of heat according to the difference between the ammonia water preparation temperature and the first temperature in combination with the second flow rate; The refrigerant temperature and the refrigerant flow rate of the cooling device are determined according to the third heat amount.

5. The method according to claim 1, characterized in that The mixing device further comprises a first spray pipe and a second spray pipe, wherein the first spray pipe is connected to the liquid ammonia input pipe, the second spray pipe is connected to the water inlet pipe, the first spray pipe and the second spray pipe are arranged in the ammonia water preparation box, and the first spray pipe is arranged at the lower part of the second spray pipe; After determining the first flow rate of the liquid ammonia input pipeline and the second flow rate of the water inlet pipeline according to the prepared ammonia water concentration, the method further includes: The opening of the first valve of the spray port of the first spray pipe is controlled according to the first flow rate to spray, and the opening of the second valve of the spray port of the second spray pipe is controlled according to the second flow rate to spray.

6. The method according to claim 5, characterized in that The mixing device further comprises a packing layer, wherein the packing layer is arranged below the second spraying pipe, and the first spraying pipe is located in the packing layer or below the packing layer; The equipment for preparing ammonia water also includes an ammonia recycling pipeline, the air inlet of the ammonia recycling pipeline is arranged on the top of the ammonia water preparation box, and the air outlet of the ammonia recycling pipeline is arranged in the packing layer, or is located below the packing layer.

7. The method according to claim 1, characterized in that The cooling device includes a cooling pipe, and the mixing device includes a mixing spray pipe, the mixing spray pipe is connected to the liquid ammonia input pipe and the water inlet pipe, the mixing spray pipe and the cooling pipe are coaxial pipes, and the cooling pipe is located inside the mixing spray pipe.

8. A control device for preparing ammonia water, characterized in that: The equipment for preparing ammonia water comprises an ammonia water preparation box, a liquid ammonia input pipeline, a water inlet pipeline, a mixing device, a cooling device, an ammonia water outlet and a controller, wherein the liquid ammonia input pipeline is used to input liquid ammonia into the ammonia water preparation box, and vaporizes the liquid ammonia in the ammonia water preparation box to generate ammonia gas, the water inlet pipeline is used to inject water for mixing into the ammonia water preparation box, the mixing device is used to mix the ammonia gas and the water to generate ammonia water, the cooling device is used to reduce the heat in the ammonia water production box, and the controller is used to control the equipment to prepare ammonia water according to the device, and the device comprises: An ammonia water preparation concentration acquisition unit, used to acquire the ammonia water preparation concentration of the ammonia water to be prepared; A flow determination unit, used to determine a first flow of the liquid ammonia input pipeline and a second flow of the water inlet pipeline according to the prepared ammonia water concentration; a heat determination unit, for determining, according to a first flow rate of the liquid ammonia input pipeline, a first heat absorbed by the liquid ammonia when vaporizing in the ammonia water preparation tank, and a second heat generated by the ammonia gas dissolving to generate ammonia water; The ammonia water preparation unit is used to determine the water temperature of the water inlet pipe and the refrigerant temperature and refrigerant flow of the cooling device according to the first heat, the second heat and a preset ammonia water preparation temperature, and prepare ammonia water according to the determined water temperature of the water inlet pipe, the refrigerant temperature and the refrigerant flow.

9. A control device for gas-water preparation, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the gas-water preparation control device implements the method as described in any one of claims 1-7.

10. A computer program product comprising computer program instructions, characterized in that When the computer program is executed, the method according to any one of claims 1 to 7 is performed.

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