Steam-free ammonia distillation and absorption device and method

Abstract

The invention provides a steam-free ammonia distillation and absorption device and method, and relates to the technical field of ammonia distillation and concentration or ammonia-containing wastewater treatment. High-temperature steam is generated in the flash evaporator through hot water at the heating end of the heat pump unit, heat and ammonia stripping power are provided for ammonia distillation of original ammonia water, intervention of external steam is avoided, steam-free ammonia distillation and ammonia absorption are achieved, steam generated in the system is used for ammonia distillation, consumption of the external steam is reduced, and the ammonia absorption efficiency is improved. Therefore, the ammonia distillation cost is greatly reduced; compared with the traditional ammonia evaporation and absorption technology, the technology has obvious cost advantage and environmental protection benefit; the traditional ammonia distillation consumes steam and needs to be provided with a large cooling tower to cool the ammonia absorption liquid, but the technology adopts the refrigeration end of the heat pump unit to provide cooling capacity, and does not need to be additionally matched with a cooling system, so that the occupied area of a project is saved, and the operation and maintenance cost of a cooling device is saved at the same time.

Description

Technical Field

[0001] The invention relates to the technical field of ammonia distillation and concentration or ammonia-containing wastewater treatment, and in particular to an ammonia absorption device and method without steam evaporation. Background Art

[0002] Ammonia-containing wastewater is a common pollutant generated in industrial production processes. In the prior art, ammonia evaporation and absorption processes are often used to remove ammonia from ammonia-containing wastewater. The traditional ammonia evaporation and absorption technology is to introduce high-temperature steam into an ammonia evaporation tower, wherein the ammonia-containing wastewater is sprayed downward from the top of the tower, and the high-temperature steam enters upward from the bottom, so that the ammonia-containing wastewater and the high-temperature steam form a countercurrent, heat transfer occurs, and the ammonia-containing wastewater reaches the boiling point, ammonia evaporates and escapes, and is drawn into the ammonia absorption equipment through an induced draft fan for internal absorption to obtain ammonia water with a higher concentration; however, this process requires consumption of external steam, and at the same time, the ammonia absorption process also consumes a large amount of circulating cooling water to cool the ammonia absorption liquid, so the cost of ammonia evaporation is relatively high; therefore, we have made improvements on this and proposed a steam-free ammonia evaporation and ammonia absorption device and method.

[0003] For example, if a project processes 13 cubic meters of wastewater per hour, and the ammonia content is 8000 mg / L, and the ammonia content is required to be reduced to 10 mg / L after ammonia steaming, the project needs to consume 2.3 tons of steam and 75KW of electricity per hour. The steam price is 220 yuan / ton, and the electricity price is 0.6 yuan / KW.H, which is equivalent to 42.67 yuan / cubic meter of water treatment cost; Although some patent documents (such as an ammonia evaporation and absorption system disclosed in CN221235273U) have disclosed energy-saving technologies for recovering heat from ammonia absorption using heat pumps, these technologies often only heat the raw ammonia water and cannot achieve the effect of countercurrent evaporation of steam and raw ammonia water. Therefore, the ammonia evaporation capacity is limited and it is still difficult to meet the demand for low-cost and high-efficiency ammonia evaporation. Summary of the invention

[0004] The purpose of the present invention is to address the current problem that external steam needs to be consumed and a large amount of circulating cooling water is consumed during the ammonia absorption process to cool the ammonia absorption liquid, resulting in a high cost for ammonia evaporation.

[0005] In order to achieve the above-mentioned purpose of the invention, the present invention provides a steam-free ammonia evaporation and ammonia absorption device and method to improve the above-mentioned problems.

[0006] The specific application is as follows: A steam-free ammonia evaporation and ammonia absorption device comprises an ammonia evaporation tower, the ammonia evaporation tower is connected to an ammonia water supply structure and a flash evaporator, the flash evaporator is connected to a heating end of a heat pump unit, hot water at the heating end of the heat pump unit generates high-temperature water vapor in the flash evaporator, which provides heat for ammonia evaporation of raw ammonia water and power for ammonia stripping, so as to avoid the intervention of external steam and realize steam-free ammonia evaporation and ammonia absorption, the refrigeration end of the heat pump unit is connected to an ammonia absorption device, the refrigeration end of the heat pump unit provides cooling capacity for the ammonia absorption device, maintains the low temperature of the ammonia absorption device to continuously absorb ammonia.

[0007] A method for absorbing ammonia by steam-free ammonia evaporation, comprising: S1. The raw ammonia water is transported into the ammonia evaporation tower for spraying. The raw ammonia water flows downward through the liquid film of the packing layer, and exchanges heat with the steam produced by the flash evaporator at the bottom of the ammonia evaporation tower in countercurrent, so that the ammonia in the raw ammonia water is continuously evaporated and flows to the top of the ammonia evaporation tower; S2, ammonia gas and water vapor produced by ammonia evaporation tower flow upward through ammonia absorption equipment, ammonia gas is absorbed by chilled water in the ammonia absorption equipment, so that the chilled water temperature rises, and the ammonia concentration rises at the same time, and concentrated ammonia water is obtained; S3. The chilled water after absorbing ammonia is sent back to the refrigeration end of the heat pump unit for cooling to maintain the low temperature working condition of the chilled water. The hot water at the heating end of the heat pump unit generates high-temperature water vapor in the flash evaporator to provide heat for the ammonia evaporation of the original ammonia water and power for blowing off ammonia.

[0008] As a preferred technical solution of the present application, raw ammonia water is added into a material tank, and the raw ammonia water in the material tank is transported into the ammonia distillation tower for spraying via a material circulation pump.

[0009] As the preferred technical solution of the present application, the qualified water after deammoniation in the ammonia evaporation tower flows back to the material tank, part of which meets the standards and is discharged externally, and part of it is mixed with the original ammonia water in the material tank and then sent to the ammonia evaporation tower through the material circulation pump to evaporate ammonia.

[0010] As a preferred technical solution of the present application, concentrated ammonia water is collected in a liquid storage tank, and a portion of the concentrated ammonia water in the liquid storage tank is discharged as a finished product to a finished product tank or directly reused.

[0011] As a preferred technical solution of the present application, the ammonia distillation tower is divided into two layers, the upper layer is the distillation layer; The other part of concentrated ammonia water is sent back to the upper distillation layer of the ammonia distillation tower by the return ammonia water pump.

[0012] As a preferred technical solution of the present application, the liquid storage tank is also used to collect the chilled water discharged by the ammonia absorption equipment. The chilled water collected in the liquid storage tank is transported back to the refrigeration end of the heat pump unit through a cold water circulation pump for cooling.

[0013] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of this application: In order to solve the problem in the prior art that external steam needs to be consumed and a large amount of circulating cooling water is also consumed in the ammonia absorption process to cool the ammonia absorption liquid, thus resulting in high ammonia evaporation cost, the present application uses the hot water at the heating end of the heat pump unit to generate high-temperature water vapor in the flash evaporator, which provides heat for the ammonia evaporation of the original ammonia water and the power for blowing off ammonia, so as to avoid the intervention of external steam and realize steam-free ammonia evaporation and ammonia absorption, that is, by utilizing the steam generated inside the system to evaporate ammonia, the consumption of external steam is reduced, thereby greatly reducing the ammonia evaporation cost. This method not only improves the economic benefits, but also contributes to environmental protection and the sustainability of industrial production. Compared with traditional ammonia evaporation and absorption technology, this technology has significant cost advantages and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a steam-free ammonia evaporation and ammonia absorption device provided in this application; Figure 2 A schematic diagram of the steam-free ammonia evaporation and absorption device provided in this application with a distillation function; Figure 3 This is a schematic diagram of the steam-free ammonia evaporation and ammonia absorption device provided in this application.

[0015] Indicated in the figure: 1. Material tank; 101. Partition; 2. Material circulation pump; 3. Ammonia distillation tower; 4. Ammonia return water pump; 5. Liquid storage tank; 6. Ammonia absorption equipment; 7. Vacuum pump; 8. Cold water circulation pump; 9. Heat pump unit; 10. Flash evaporator; 11. Hot water circulation pump; 12. Water supply valve. DETAILED DESCRIPTION

[0016] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described 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 should fall within the scope of protection of the present invention.

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0019] Example 1, please refer to Figure 1-Figure 3A steam-free ammonia evaporation and ammonia absorption device comprises an ammonia evaporation tower 3, the ammonia evaporation tower 3 is connected to an ammonia water supply structure and a flash evaporator 10, the flash evaporator 10 is connected to a heating end of a heat pump unit 9, hot water at the heating end of the heat pump unit 9 generates high-temperature water vapor in the flash evaporator 10, which provides heat for ammonia evaporation of the original ammonia water and ammonia stripping power, so as to avoid the intervention of external steam and realize steam-free ammonia evaporation and ammonia absorption, the refrigeration end of the heat pump unit 9 is connected to an ammonia absorption device 6, the refrigeration end of the heat pump unit 9 provides cooling capacity for the ammonia absorption device 6, maintains the low temperature of the ammonia absorption device 6 to continuously absorb ammonia; eliminating the intervention of external steam, greatly reducing From a cost perspective, the reliance on the traditional steam supply system does not require the purchase of steam generating equipment and the laying of complex steam transmission pipelines, which significantly reduces equipment investment and maintenance costs, while reducing the high cost expenditures brought about by steam procurement. In terms of energy utilization, a large amount of heat loss caused by pipeline heat dissipation and pressure loss during steam transportation is reduced, so that energy can be more efficiently recycled within the device, effectively improving the overall energy utilization efficiency, thereby achieving dual optimization in economic and energy benefits, saving the company a lot of operating costs and complying with the concept of sustainable development.

[0020] Further, such as Figure 1 As shown, the ammonia water supply structure includes a material tank 1, the material tank 1 is connected to a material circulation pump 2, the material circulation pump 2 is connected to an ammonia evaporation tower 3, and the ammonia evaporation tower 3 is connected to the material tank 1, which is used for recovering qualified water after deammoniation. The recycling mechanism constructed by the material circulation pump 2 allows the ammonia water to be fully circulated in the system, which not only reduces the waste of qualified water, but also allows ammonia to have more opportunities to be extracted during multiple cycles of ammonia evaporation, significantly improving the utilization rate of ammonia water and reducing the cost of raw materials. From an environmental protection perspective, it reduces the amount of waste liquid discharged, reduces the pollution pressure on the environment, and meets the requirements of green production.

[0021] Further, such as Figure 1 As shown, the energy generated by the heat pump unit 9 can be transmitted to the ammonia absorption device 6, and the ammonia absorption device 6 is connected to the liquid storage tank 5 to provide stable and appropriate energy support for the distillation process. In the distillation process, the reasonable distribution and utilization of heat promotes the effective separation of ammonia and other components, and improves the separation purity and recovery rate of ammonia, which not only improves the product quality, makes the final ammonia product more in line with the high purity requirements, but also increases the economic benefits of the enterprise; The ammonia absorption device 6 can be an absorption tower or a heat exchanger, and the absorption tower or the heat exchanger utilizes the refrigeration end of the heat pump unit 9 to maintain the required low temperature working conditions; an induced draft fan can be provided between the ammonia evaporation tower 3 and the ammonia absorption device 6, or an induced draft fan can be not provided. When the induced draft fan is not provided, the ammonia gas and water vapor produced by the ammonia evaporation tower 3 are sucked by the low negative pressure of the ammonia absorption device 6; The refrigeration end of the heat pump unit 9 can directly provide cooling capacity for the ammonia absorption liquid in the absorption tower; the refrigeration end of the heat pump unit 9 cooperates with the heat exchanger to indirectly provide cooling capacity for the ammonia absorption liquid.

[0022] Further, such as Figure 1 As shown, the liquid storage tank 5 is connected to a cold water circulation pump 8, and the cold water circulation pump 8 is connected to the refrigeration end of the heat pump unit 9. The cold water circulation pump 8 ensures the stable circulation of cold water between the liquid storage tank 5 and the heat pump unit 9. The refrigeration function of the heat pump unit 9 is used to accurately maintain the low temperature environment required for the ammonia absorption process. The low temperature environment is crucial for ammonia absorption. It significantly improves the ammonia absorption efficiency, allowing ammonia to be dissolved in water more quickly and fully to form concentrated ammonia water. At the same time, by reasonably utilizing the refrigeration and heating cycle of the heat pump unit 9, the dependence on additional independent refrigeration equipment is reduced, and the high cost and energy consumption caused by the purchase and operation of multiple sets of refrigeration equipment are reduced. On the premise of ensuring the ammonia absorption effect, the production cost is reduced and the energy utilization rate is greatly improved, realizing the organic combination of efficient energy utilization and cost control.

[0023] Further, such as Figure 1 As shown, the flash evaporator 10 is also connected to a hot water circulation pump 11, which is connected to the heating end of the heat pump unit 9. The cooperation between the hot water circulation pump 11 and the heat pump unit 9 ensures that the hot water can continuously generate high-temperature water vapor in the flash evaporator 10, providing a continuous, stable and sufficient source of heat and power for the ammonia evaporation process.

[0024] Further, such as Figure 1 As shown, the hot water circulation pump 11 is also connected to a water replenishment valve 12, and the water replenishment valve 12 is connected to a water replenishment source for replenishing water to the heat pump unit 9 through the hot water circulation pump 11. The ingenious design of the water replenishment valve 12 and the water replenishment source provides a solid guarantee for the stable operation of the heat pump unit 9. During the long-term operation of the device, the moisture in the heat pump unit 9 will gradually decrease due to evaporation, leakage and the like. The water replenishment valve 12 can replenish the required moisture in time to ensure that the system is always in a good water balance state.

[0025] Example 2 further optimizes the steam-free ammonia evaporation and ammonia absorption device provided in Example 1. Specifically, Figure 2As shown, an ammonia return pump 4 is connected between the liquid storage tank 5 and the ammonia evaporation tower 3. The liquid storage tank 5 serves as a storage hub for concentrated ammonia water, and can stably collect concentrated ammonia water after distillation and absorption, thereby reducing the disordered flow and loss of concentrated ammonia water in the production process. In this embodiment, the ammonia evaporation tower 3 is double-layered, and part of the concentrated ammonia water is sent back to the upper layer of the ammonia evaporation tower 3 for further distillation through the ammonia return pump 4, thereby realizing the deep extraction and recycling of ammonia resources. This process not only improves the overall extraction rate of ammonia, ensures that the ammonia content in the product can be stably maintained at a high level, and improves the product value, but also reduces the residual ammonia in the final product, reduces resource waste, and from an environmental protection perspective, reduces the risk of environmental pollution caused by excessive ammonia residue, making the entire production process more environmentally friendly, efficient, and economical. The liquid storage tank 5 has two chambers, which are respectively used to collect concentrated ammonia water and chilled water.

[0026] Example 3 further optimizes the steam-free ammonia evaporation and ammonia absorption device provided in Example 1. Specifically, Figure 1 As shown, a partition 101 is provided in the material tank 1, and the partition 101 divides the material tank 1 into two areas, and the two areas are divided into left and right. The area on the left is used to connect the raw ammonia water inlet and the material circulation pump 2, and the area on the right corresponds to the ammonia evaporation tower 3 and the discharge of qualified water after deammoniation. The qualified water input from the ammonia evaporation tower 3 to the material tank 1 overflows to the top of the partition 101, so that a part of the qualified water passes through the partition 101 into the left area and mixes with the raw ammonia water; the other part of the qualified water in the material tank 1 is discharged to the outside.

[0027] Further, such as Figure 1 As shown, the ammonia absorption device 6 is connected to a vacuum pump 7. The connection between the vacuum pump 7 and the ammonia absorption device 6 creates an ideal negative pressure environment for the distillation process. Under negative pressure conditions, the solubility of ammonia in the solution is significantly reduced, and it is easier to escape from the solution and enter the gas phase, which greatly promotes the separation process of ammonia from the mixed gas or solution. This not only improves the distillation efficiency and enables ammonia to be separated from other components, but also improves the recovery purity of ammonia to obtain a higher quality ammonia product.

[0028] Embodiment 4, a method for absorbing ammonia by steam-free ammonia evaporation, comprising: S1, raw ammonia water is added into the feed tank 1, and the raw ammonia water in the feed tank 1 is transported into the ammonia evaporation tower 3 by the material circulation pump 2 for spraying. The raw ammonia water flows downward through the liquid film of the packing layer of the ammonia evaporation tower 3, and countercurrently exchanges heat with the steam produced by the flash evaporator 10 at the bottom of the ammonia evaporation tower 3, so that the ammonia in the raw ammonia water is continuously evaporated and flows to the top of the ammonia evaporation tower 3. The countercurrent heat exchange method is adopted, and the temperature difference and flow direction difference between the steam and the raw ammonia water are cleverly utilized, which greatly increases the contact area and contact time between the two. The sufficient contact provides good conditions for heat transfer, so that ammonia can be evaporated from the raw ammonia water more efficiently, and the recovery rate of ammonia is improved. The design of middle spraying combined with liquid film flow ensures that the ammonia water is evenly distributed in the ammonia evaporation tower, and reduces the problems of uneven heat exchange and poor ammonia evaporation effect caused by local ammonia water accumulation or poor flow; The qualified water after deammoniation flows back to the feed tank 1, part of the qualified water meets the standards and is discharged, and part of the qualified water is mixed with the original ammonia water in the feed tank 1, and then sent to the ammonia evaporation tower 3 through the material circulation pump 2 to evaporate ammonia. The reflux of qualified water forms an efficient internal circulation system. From the perspective of resource utilization, it reduces the waste of water resources, makes full use of the small amount of ammonia resources remaining in the qualified water, improves the overall extraction rate of ammonia, reduces the cost of raw materials, and evaporates ammonia again after mixing with the original ammonia water, further optimizing the ammonia concentration, so that the ammonia evaporation process can be carried out within a more suitable concentration range, and improves the efficiency and stability of ammonia evaporation. This recycling mode not only conforms to the concept of green environmental protection, reduces the pressure of waste liquid discharge on the environment, but also improves the benefits of the enterprise from an economic level; S2, ammonia gas and water vapor produced by ammonia evaporation tower 3 flow upward through ammonia absorption equipment 6, ammonia gas is absorbed by chilled water in ammonia absorption equipment 6, so that the chilled water temperature rises, and the ammonia concentration rises at the same time, and concentrated ammonia water is obtained. The method of using chilled water to absorb ammonia gas fully utilizes the low temperature and high solubility characteristics of chilled water. The low temperature environment is conducive to the dissolution and absorption of ammonia gas, so that ammonia gas can quickly and efficiently enter the water to form concentrated ammonia water, thereby improving the ammonia absorption efficiency; The concentrated ammonia water is collected in the liquid storage tank 5, and part of the concentrated ammonia water in the liquid storage tank 5 is discharged as a finished product to the finished product tank or directly reused; S3, after absorbing ammonia, the chilled water discharged from the ammonia absorption equipment 6 is collected and sent back to the refrigeration end of the heat pump unit 9 for cooling, so as to maintain the low temperature working condition of the chilled water, and the hot water at the heating end of the heat pump unit 9 generates high-temperature water vapor in the flash evaporator 10, which provides heat for the ammonia evaporation of the original ammonia water and the power for blowing off ammonia. The recycling of chilled water and the coordinated work of the heat pump unit 9 build an efficient energy and temperature control closed-loop system. After absorbing ammonia, the chilled water is sent back to the refrigeration end of the heat pump unit 9 for cooling, which makes full use of the refrigeration function of the heat pump unit 9 and accurately maintains the low temperature environment required for the ammonia absorption process. The low temperature environment is not only conducive to the absorption of ammonia, but also improves High ammonia absorption efficiency, and ensure the stability and reliability of the ammonia absorption process. At the same time, the hot water generated by the heating end of the heat pump unit 9 generates high-temperature steam in the flash evaporator 10, which provides continuous heat and ammonia stripping power for the ammonia evaporation process. This two-way energy recycling mode reduces the problems of energy waste and excessive equipment investment caused by the use of independent equipment for refrigeration and heating in the traditional production process, significantly improves energy utilization, and reduces production costs. The entire system not only ensures the efficient operation of the production process, but also achieves energy conservation and environmental friendliness, and improves the comprehensive benefits and market competitiveness of the device; The liquid storage tank 5 is also used to collect the chilled water discharged by the ammonia absorption device 6. The chilled water collected by the liquid storage tank 5 is transported back to the refrigeration end of the heat pump unit 9 through the cold water circulation pump 8 for cooling. That is, the present application uses the refrigeration end of the heat pump unit 9 to cool the chilled water, so that the present application does not need to use a traditional cooling tower for the chilled water refrigeration process. This feature greatly simplifies the architecture of the entire refrigeration system. Traditional cooling towers are often large in size and complex in structure, involving numerous auxiliary equipment and pipeline connections, and occupying a large space. The design of the present application reduces a large amount of space occupied by the cooling tower and its supporting facilities, can effectively reduce the transformation difficulties caused by space limitations, improve space utilization, and free up more available space for other equipment or production links; Secondly, from the perspective of cost, not relying on traditional cooling towers has brought about further cost reduction. In terms of equipment procurement, the purchase cost of the cooling tower itself and the installation and commissioning costs can be saved; after omitting the cooling tower in this system, the operation and maintenance costs of the cooling tower are effectively controlled, reducing the company's long-term operating costs in the refrigeration link, enhancing the company's competitiveness in the market, and bringing more considerable economic benefits to the company; The above processes are carried out in parallel without any order or restriction relationship; the steam-free ammonia evaporation recorded in this method means that no external steam is consumed, and the ammonia evaporation process still uses steam as thermal energy and kinetic energy to drive the ammonia evaporation, but the steam comes from the system itself. This method can be carried out under vacuum or under normal pressure.

[0029] In Example 5, the ammonia evaporation tower 3 is divided into an upper and lower layer, and the upper layer is a distillation layer, and the distillation layer has a distillation packing layer. The ammonia gas and water vapor produced by the ammonia evaporation flow upward through the distillation layer, and the water vapor is absorbed by the distillation liquid, so that the distillation liquid obtains heat, and the ammonia gas in the distillation liquid evaporates, and the distillation layer; another part of the concentrated ammonia water is sent back to the ammonia evaporation tower 3 for distillation by the return ammonia water pump 4, and the other part of the concentrated ammonia water is sent back to the upper layer of the ammonia evaporation tower 3 for distillation by the return ammonia water pump 4, so as to realize the deep excavation and recycling of ammonia resources. In the distillation layer, the heat of water vapor is used to drive the evaporation of ammonia gas in the distillation liquid, and an ingenious internal energy recycling mechanism is constructed. This mechanism makes full use of the heat of water vapor generated in the ammonia evaporation process, reduces the demand for external additional heat supply, significantly improves energy utilization, and reduces energy consumption and production costs; Example 6, taking the wastewater treatment volume of 13 cubic meters / hour, the ammonia content of 8000 mg / L, and requiring the ammonia content to drop to 10 mg / L after ammonia evaporation as an example, the equilibrium process of the present application is as follows: the heat pump unit 9 is used to produce 10°C chilled water at the refrigeration end and 55°C hot water at the heating end, and under vacuum conditions, the 55°C hot water is used to produce 50°C saturated water vapor, and ammonia is absorbed by practical evaporation. Compared with the traditional method, the technical and economic benefits are shown in the following table: It can be seen from the above table that the ammonia evaporation cost of this technology is only about 35% of the traditional ammonia evaporation cost, energy saving is more than 65%, and it has good economic benefits.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A steam-free ammonia evaporation and ammonia absorption device, characterized in that: The invention comprises an ammonia evaporation tower (3), wherein the ammonia evaporation tower (3) is connected to an ammonia water supply structure and a flash evaporator (10), wherein the flash evaporator (10) is connected to a heating end of a heat pump unit (9), and hot water at the heating end of the heat pump unit (9) generates high-temperature water vapor in the flash evaporator (10), which provides heat for ammonia evaporation of raw ammonia water and power for blowing off ammonia, thereby avoiding the intervention of external steam and realizing steam-free ammonia evaporation and ammonia absorption, and the cooling end of the heat pump unit (9) is connected to an ammonia absorption device (6), and the cooling end of the heat pump unit (9) provides cooling capacity for the ammonia absorption device (6), thereby maintaining the low temperature of the ammonia absorption device (6) so as to continuously absorb ammonia gas.

2. The ammonia absorption device without steam evaporation according to claim 1, characterized in that: The ammonia water supply structure comprises a material tank (1), the material tank (1) is connected to a material circulation pump (2), the material circulation pump (2) is connected to an ammonia still (3), and the ammonia still (3) is connected to the material tank (1), for recovering qualified water after deammoniation; The ammonia absorption device (6) is connected to a liquid storage tank (5); the liquid storage tank (5) is connected to a cold water circulation pump (8), and the cold water circulation pump (8) is connected to the refrigeration end of the heat pump unit (9).

3. The ammonia absorption device without steam evaporation according to claim 2, characterized in that: An ammonia return pump (4) is connected between the liquid storage tank (5) and the ammonia distillation tower (3).

4. A steam-free ammonia evaporation and ammonia absorption device according to claim 1, 2 or 3, characterized in that: The flash evaporator (10) is also connected to a hot water circulation pump (11), and the hot water circulation pump (11) is connected to the heating end of the heat pump unit (9).

5. A method for absorbing ammonia by steam-free ammonia evaporation, characterized in that: include: S1, conveying the raw ammonia water into the ammonia evaporation tower (3) for spraying, the raw ammonia water flows downward through the liquid film of the packing layer, and countercurrently exchanges heat with the steam produced by the flash evaporator (10) at the bottom of the ammonia evaporation tower (3), so that ammonia in the raw ammonia water is continuously evaporated and flows to the top of the ammonia evaporation tower (3); S2, ammonia gas and water vapor produced by ammonia evaporation in the ammonia evaporation tower (3) flow upward through the ammonia absorption device (6), and the ammonia gas is absorbed by the chilled water in the ammonia absorption device (6), so that the chilled water temperature rises and the ammonia concentration increases, thereby obtaining concentrated ammonia water; S3, the chilled water after absorbing ammonia is sent back to the cooling end of the heat pump unit (9) for cooling, thereby maintaining the low temperature of the chilled water. The hot water at the heating end of the heat pump unit (9) generates high-temperature water vapor in the flash evaporator (10), thereby providing heat for the evaporation of ammonia from the original ammonia water and power for blowing off ammonia.

6. The method for absorbing ammonia by steam-free ammonia evaporation according to claim 5, characterized in that: The raw ammonia water is added into the material tank (1), and the raw ammonia water in the material tank (1) is transported into the ammonia distillation tower (3) through the material circulation pump (2) for spraying.

7. The method for absorbing ammonia by steam-free ammonia evaporation according to claim 6, characterized in that: The qualified water after deammoniation in the ammonia evaporation tower (3) flows back to the material tank (1), a part of the qualified water meets the standards and is discharged, and a part of the qualified water is mixed with the original ammonia water in the material tank (1) and then sent to the ammonia evaporation tower (3) through the material circulation pump (2) to evaporate ammonia.

8. The method for absorbing ammonia by steam-free ammonia evaporation according to claim 5, characterized in that: The concentrated ammonia water is collected in the liquid storage tank (5), and a portion of the concentrated ammonia water in the liquid storage tank (5) is discharged as a finished product to a finished product tank or directly reused.

9. The method for absorbing ammonia by steam-free ammonia evaporation according to claim 8, characterized in that: The ammonia distillation tower (3) is divided into two layers, the upper layer being the distillation layer; The other part of the concentrated ammonia water in the liquid storage tank (5) is sent back to the upper layer of the ammonia distillation tower (3) by the ammonia return pump (4) for rectification.

10. A method for absorbing ammonia by steam-free ammonia evaporation according to claim 8 or 9, characterized in that: The liquid storage tank (5) is also used to collect chilled water discharged from the ammonia absorption device (6). The chilled water collected by the liquid storage tank (5) is transported back to the refrigeration end of the heat pump unit (9) through the cold water circulation pump (8) for cooling.

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