Steam-free ammonia distilling and absorbing device

Abstract

The utility model provides a steam-free ammonia distillation and absorption device, 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, the economic benefit is improved, and environmental protection and sustainability of industrial production are facilitated; 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 is also provided with a large cooling tower for cooling the ammonia absorption liquid, but the technology does not need to be used, 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 utility model relates to ammonia distillation concentration or ammonia-containing wastewater treatment technical field, specifically, a kind of steam-free ammonia distillation ammonia absorption device. BACKGROUND

[0002] Ammonia-containing wastewater is a common pollutant generated in industrial production process, in the prior art, ammonia in ammonia-containing wastewater is removed by steam absorption process, and traditional steam absorption technology is to introduce high-temperature steam into ammonia distillation tower, wherein ammonia-containing wastewater is sprayed from the top of the tower downward, and high-temperature steam enters from the bottom upward, so that ammonia-containing wastewater and high-temperature steam form countercurrent, heat transfer occurs, ammonia-containing wastewater reaches boiling point, ammonia evaporates and escapes, and is then absorbed in the absorption tower by an induced draft fan to obtain ammonia water with high concentration; However, this process consumes external steam, and a large amount of circulating cooling water is also consumed to cool the ammonia absorption liquid during the ammonia absorption process, so the cost of ammonia distillation is high; Therefore, we improve it and propose a steam-free ammonia distillation ammonia absorption device.

[0003] For example, a project needs to treat 13 cubic meters of wastewater per hour, and the ammonia content is 8000 mg / L. After ammonia distillation, the ammonia content is required to be reduced to 10 mg / L. The project needs to consume 2.3 tons of steam per hour and 75 KW of electricity. The price of steam is 220 yuan / ton, and the price of electricity is 0.6 yuan / KW.H. The cost of treating one cubic meter of water is 42.67 yuan / cubic meter.

[0004] Although some patent documents (such as CN221235273U disclose a steam ammonia absorption system) disclose energy-saving technology for recovering ammonia absorption heat by using a heat pump, these documents only heat the original ammonia water and cannot achieve the effect of countercurrent evaporation of steam and original ammonia water, so the ammonia distillation capacity is limited and it is still difficult to meet the demand for low-cost and high-efficiency ammonia distillation. UTILITY MODEL CONTENTS

[0005] The utility model aims at the problem that external steam needs to be consumed, and a large amount of circulating cooling water is also consumed to cool the ammonia absorption liquid during the ammonia absorption process, so the cost of ammonia distillation is high.

[0006] In order to achieve the above-mentioned utility model purposes, the utility model provides a steam-free ammonia distillation ammonia absorption device to improve the above-mentioned problems.

[0007] The application is as follows:

[0008] A steam-free ammonia distillation ammonia absorption device, comprising an ammonia distillation tower, an ammonia water supply structure and a flash evaporator connected to the ammonia distillation tower, and a heat pump unit connected to the flash evaporator. High-temperature steam is generated in the flash evaporator by hot water at the heating end of the heat pump unit, which provides heat and stripping ammonia power for ammonia distillation of the original ammonia water, so as to avoid the intervention of external steam and realize steam-free ammonia distillation ammonia absorption.

[0009] As the preferred technical scheme of the present application, the ammonia water supply structure comprises a tank, a material circulating pump connected to the tank, the material circulating pump connected to an ammonia stripping tower, the ammonia stripping tower connected to the tank, and the tank used for recycling qualified water after ammonia removal.

[0010] As the preferred technical scheme of the present application, the ammonia stripping tower is connected to an absorption tower, the absorption tower is connected to a heat pump unit, and the absorption tower is connected to a liquid storage tank.

[0011] As the preferred technical scheme of the present application, a return ammonia water pump is connected between the liquid storage tank and the ammonia stripping tower.

[0012] As the preferred technical scheme of the present application, the liquid storage tank has two chambers for collecting concentrated ammonia water and chilled water, respectively.

[0013] As the preferred technical scheme of the present application, the liquid storage tank is connected to a chilled water circulating pump, and the chilled water circulating pump is connected to the heat pump unit.

[0014] As the preferred technical scheme of the present application, the flash evaporator is further connected to a hot water circulating pump, and the hot water circulating pump is connected to the heat pump unit.

[0015] As the preferred technical scheme of the present application, the hot water circulating pump is further connected to a water supplement valve, the water supplement valve is connected to a water supplement source, and the water supplement valve is used for supplementing water to the heat pump unit through the hot water circulating pump.

[0016] As the preferred technical scheme of the present application, a partition is arranged in the tank, the tank is divided into two regions by the partition, and the two regions are used for corresponding original ammonia water adding ports and ammonia stripping towers.

[0017] As the preferred technical scheme of the present application, the absorption tower is connected to a vacuum pump.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] In the scheme of the present application:

[0020] In order to solve the problem that external steam needs to be consumed in the prior art, and a large amount of circulating cooling water needs to be consumed for cooling the ammonia absorption liquid in the ammonia absorption process, thereby increasing the ammonia stripping cost, the present application generates high-temperature water vapor in the flash evaporator by using hot water of the heat pump unit heating end, provides heat and stripping ammonia power for ammonia stripping of the original ammonia water, avoids the intervention of external steam, realizes steam-free ammonia stripping and ammonia absorption, that is, ammonia stripping is performed by using the steam generated in the system, thereby reducing the consumption of external steam, greatly reducing the ammonia stripping cost, improving the economic benefit, and helping environmental protection and sustainability of industrial production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The schematic diagram of the steam-free ammonia distillation and absorption device provided in the present application is shown in the figure.

[0022] Figure 2 The schematic diagram of the steam-free ammonia distillation and absorption device provided in the present application is shown in the figure.

[0023] Figure 3 The schematic diagram of the steam-free ammonia distillation and absorption device provided in the present application is shown in the figure.

[0024] Indicated in the figure:

[0025] 1, tank; 101, partition; 2, material circulating pump; 3, ammonia distillation tower; 4, ammonia return water pump; 5, liquid storage tank; 6, absorption tower; 7, vacuum pump; 8, cold water circulating pump; 9, heat pump unit; 10, flash evaporator; 11, hot water circulating pump; 12, water replenishment valve. DETAILED DESCRIPTION

[0026] In order to make the person skilled in the art better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0027] It should be noted that the embodiments and the features and technical schemes in the embodiments in the present application can be combined with each other without conflict.

[0028] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] Embodiment 1, Embodiment 1, please refer to Figures 1-3The application discloses a steam-free ammonia distillation and ammonia absorption device, which comprises an ammonia distillation tower 3, an ammonia water supply structure and a flash evaporator 10 connected with the ammonia distillation tower 3, and a heat pump unit 9 connected with the flash evaporator 10. High-temperature water vapor is generated in the flash evaporator 10 by using hot water at the heating end of the heat pump unit 9, so as to provide heat and ammonia stripping power for ammonia distillation of original ammonia water, thereby realizing steam-free ammonia distillation and ammonia absorption without intervention of external steam. The refrigeration end of the heat pump unit 9 provides cold energy for ammonia absorption liquid, so that the ammonia absorption liquid can continuously absorb ammonia gas. The steam-free ammonia distillation and ammonia absorption device greatly reduces the dependence on a traditional steam supply system. From the cost perspective, the steam generation equipment and the complex steam delivery pipeline do not need to be purchased, equipment investment and maintenance cost are reduced, high cost expenditure caused by steam purchase is reduced, energy loss caused by pipeline heat dissipation and pressure loss in the steam delivery process is reduced, energy can be more efficiently recycled in the device, the overall energy utilization efficiency is improved, and therefore, double optimization in economy and energy efficiency is realized, a large amount of operation cost of an enterprise is saved, and the sustainable development concept is met.

[0030] Further, as shown in Figure 1 , the ammonia water supply structure comprises a tank 1 connected with a material circulating pump 2, the material circulating pump 2 is connected with the ammonia distillation tower 3, and the ammonia distillation tower 3 is connected with the tank 1, so as to recycle qualified water after ammonia removal. The recycling mechanism formed by the material circulating pump 2 enables ammonia water to be fully recycled in the system, which not only reduces waste of qualified water, but also enables ammonia to be extracted more times in the recycling ammonia distillation process, significantly improves the utilization rate of ammonia water, reduces the raw material cost, reduces the waste liquid discharge amount from the environmental protection aspect, reduces the pollution pressure on the environment, and meets the green production requirement.

[0031] Further, as shown in Figure 1 , the ammonia distillation tower 3 is connected with an absorption tower 6, the absorption tower 6 is connected with the heat pump unit 9, energy generated by the heat pump unit 9 can be transmitted to the absorption tower 6, and the absorption tower 6 is connected with a liquid storage tank 5, so as to provide stable and suitable energy support for a rectification process. In the rectification process, reasonable distribution and utilization of heat promote effective separation of ammonia gas and other components, improve the separation purity and recovery rate of ammonia gas, improve the product quality, make the finally obtained ammonia product meet the high-purity requirement, and increase the economic benefit of an enterprise.

[0032] Further, as shown in Figure 1As shown, the liquid tank 5 is connected with a cold water circulating pump 8, the cold water circulating pump 8 is connected with a heat pump unit 9, the cold water circulating pump 8 ensures the stable circulation of cold water between the liquid tank 5 and the heat pump unit 9, and by using the refrigeration function of the heat pump unit 9, the low-temperature environment required for the ammonia absorption process is accurately maintained, which is crucial for ammonia absorption, significantly improves the ammonia absorption efficiency, and enables ammonia to be more quickly and fully dissolved in water 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.

[0033] Further, as shown in Figure 1 The flash evaporator 10 is also connected with a hot water circulating pump 11, the hot water circulating pump 11 is connected with the heat pump unit 9, and the cooperation of the hot water circulating pump 11 and the heat pump unit 9 ensures that hot water can continuously produce high-temperature steam in the flash evaporator 10, providing a continuous, stable and sufficient source of heat and power for the ammonia evaporation process.

[0034] Further, as shown in Figure 1 The hot water circulating pump 11 is also connected with a water supplement valve 12, the water supplement valve 12 is connected with a water supplement source, and is used to supplement water to the heat pump unit 9 through the hot water circulating pump 11. The ingenious design of the water supplement valve 12 and the water supplement source provides a solid guarantee for the stable operation of the heat pump unit 9. During the long-term operation of the device, the water in the heat pump unit 9 will gradually decrease due to evaporation, leakage and other reasons. The water supplement valve 12 can supplement the required water in time to ensure that the system is always in a good water balance state.

[0035] In example 2, the steam-free ammonia absorption and evaporation device provided in example 1 is further optimized, specifically, as shown in Figure 2 The liquid tank 5 is connected with an ammonia return water pump 4 between the ammonia evaporation tower 3, the liquid tank 5 as the storage hub of concentrated ammonia water can stably collect concentrated ammonia water after rectification and absorption, reduce the disordered flow and loss of concentrated ammonia water in the production process, in this embodiment, the ammonia evaporation tower 3 is double-layer, part of the concentrated ammonia water is sent back to the upper layer of the ammonia evaporation tower 3 by the ammonia return water pump 4 for rectification again, realizing the deep extraction and cyclic utilization of ammonia resources, which 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, improves the product value, but also reduces the residual ammonia in the final product, reduces resource waste, from the environmental protection point of view, reduces the risk of environmental pollution caused by excessive ammonia residue, makes the whole production process more environmentally friendly, efficient and economical, the liquid tank 5 has two cavities for collecting concentrated ammonia water and refrigerated water.

[0036] Example 3, the ammonia absorption device provided in Example 1 is further optimized, specifically, as shown in Figure 1 The baffle 101 is arranged in the trough 1, the baffle 101 divides the trough 1 into two regions, and the two regions are divided into left and right. The left region is used for connecting the raw ammonia water inlet and the material circulating pump 2. The right region corresponds to the ammonia stripping tower 3 and the discharge of qualified water after ammonia removal. The qualified water input by the ammonia stripping tower 3 to the trough 1 overflows to the top of the baffle 101, so that part of the qualified water enters the left region through the baffle 101 and mixes with the raw ammonia water. Another part of the qualified water in the trough 1 is discharged outside.

[0037] Further, as shown in Figure 1 The absorption tower 6 is connected with the vacuum pump 7. The connection of the vacuum pump 7 and the absorption tower 6 creates an ideal negative pressure environment for the rectification process. Under the condition of negative pressure, the solubility of ammonia gas in the solution is significantly reduced, which is more easily escaped from the solution and enters the gas phase, greatly promoting the separation process of ammonia gas from the mixed gas or solution. This not only improves the rectification efficiency, but also enables ammonia gas to be separated from other components, and improves the recovery purity of ammonia gas, so that higher quality ammonia products are obtained.

[0038] In use:

[0039] S1, raw ammonia water is added into the trough 1, and the raw ammonia water in the trough 1 is transported into the ammonia stripping tower 3 by the material circulating pump 2 for spraying. The raw ammonia water flows downward by the liquid film of the packing layer of the ammonia stripping tower 3, and exchanges heat with the steam produced by the flash evaporator 10 at the bottom of the ammonia stripping tower 3 in countercurrent, so that the ammonia in the raw ammonia water is continuously stripped out and flows to the top of the ammonia stripping tower 3;

[0040] The qualified water after ammonia removal flows back to the trough 1. Part of the qualified water is discharged, and part of the qualified water mixes with the raw ammonia water in the trough 1 and is then sent into the ammonia stripping tower 3 by the material circulating pump 2 for ammonia stripping;

[0041] S2, the ammonia gas and water vapor produced by the ammonia stripping of the ammonia stripping tower 3 flow upward through the absorption tower 6, and the ammonia gas is absorbed by the chilled water in the absorption tower 6, so that the temperature of the chilled water rises, and the ammonia concentration rises, and concentrated ammonia water is obtained;

[0042] 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 a finished product tank or directly reused;

[0043] S3, the chilled water collected after the ammonia absorption is discharged from the absorption tower 6 and is 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. 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 and stripping ammonia power for the ammonia stripping of the raw ammonia water;

[0044] The liquid storage tank 5 is also used to collect the chilled water discharged from the absorption tower 6, and the chilled water collected by the liquid storage tank 5 is delivered back to the refrigeration end of the heat pump unit 9 through the cold water circulating pump 8 for cooling, that is, the refrigeration end of the heat pump unit 9 is used to cool the chilled water, so that the application does not need to use the traditional cooling tower for the refrigeration process of the chilled water. Compared with the traditional steam absorption ammonia technology, the technology has significant cost advantage and environmental protection benefit. Because the traditional steam ammonia consumes steam and needs to configure a large cooling tower to cool the ammonia absorption liquid, but the present technology does not need this, which saves the project land occupation and the operation and maintenance cost of the cooling device.

[0045] The above processes are carried out in parallel, and there is no sequence or constraint relationship. The steam-free ammonia absorption described in the application refers to not consuming external steam, but the ammonia absorption process still uses steam as heat and kinetic energy to drive ammonia absorption. The steam is from the system itself. The application can be carried out under vacuum or under normal pressure.

[0046] In embodiment 4, the ammonia absorption tower 3 is divided into two layers, and the upper layer is a rectification layer, and the rectification layer has a rectification filler layer. The ammonia gas and water vapor produced by the ammonia absorption flow upward through the rectification layer, the water vapor is absorbed by the rectification liquid, the rectification liquid obtains heat, the ammonia gas in the rectification liquid is evaporated, and the rectification layer; another part of the concentrated ammonia water is sent back to the rectification of the ammonia absorption tower 3 by the ammonia return pump 4, and the other part of the concentrated ammonia water is sent back to the rectification of the upper layer of the ammonia absorption tower 3 by the ammonia return pump 4, realizing the deep excavation and recycling of ammonia resources. In the rectification layer, the heat of the water vapor is used to drive the evaporation of the ammonia gas in the rectification liquid, and a clever internal energy recycling mechanism is constructed. This mechanism fully utilizes the heat of the water vapor produced in the ammonia absorption process, reduces the demand for external additional heat supply, significantly improves the energy utilization rate, and reduces the energy consumption and production cost;

[0047] In embodiment 5, the treatment wastewater is 13 m3 / h, the ammonia content is 8000 mg / L, and the ammonia content is required to be reduced to 10 mg / L after ammonia absorption. The balance process of the application is as follows: 10℃ chilled water is produced by the refrigeration end of the heat pump unit 9, 55℃ hot water is produced by the heating end, and 50℃ saturated water vapor is produced under vacuum conditions. The technology is used for steam absorption ammonia. Compared with the traditional method, the technical and economic benefits are shown in the following table:

[0048]

[0049] From the above table, it can be seen that the ammonia absorption cost of the present technology is only about 35% of the traditional ammonia absorption cost, and the energy saving is more than 65%, which has good economic benefits.

[0050] In the utility model, unless another definite provision and limitation, the term "mount", "link", "connect", "fix" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.For ordinary skilled person in the art, can understand the above-mentioned term in the utility model concrete meaning according to specific circumstances.

[0051] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and not all the embodiments, the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model.The utility model can be realized in many different forms, and contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or make equivalent replacement to part of the technical features.For equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the utility model.

Claims

1. A steamless ammonia distilling apparatus, characterized by, The application relates to a steam ammonia tower (3) connected with an ammonia water supply structure and a flash evaporator (10) connected with a heat pump unit (9), wherein high-temperature water vapor is generated in the flash evaporator (10) by using hot water at the heating end of the heat pump unit (9) to provide heat and stripping power for steam ammonia of original ammonia water, so that external steam is not needed, steam ammonia absorption is realized without steam.

2. The device according to claim 1, wherein The ammonia water supply structure comprises a tank (1) connected with a material circulating pump (2) connected with the steam ammonia tower (3) connected with the tank (1) for recycling qualified water after ammonia removal.

3. The device according to claim 1, wherein The steam ammonia tower (3) is connected with an absorption tower (6) connected with the heat pump unit (9), and the absorption tower (6) is connected with a liquid storage tank (5).

4. The device according to claim 3, wherein The liquid storage tank (5) is connected with the steam ammonia tower (3) through a return ammonia water pump (4).

5. The device according to claim 3, wherein The liquid storage tank (5) has two cavities for collecting concentrated ammonia water and refrigerated water respectively.

6. A device for absorbing ammonia without steaming according to claim 4 or 5, characterized in that The liquid storage tank (5) is connected with a cold water circulating pump (8) connected with the heat pump unit (9).

7. The steam-free ammonia distilling and absorbing device according to claim 1, characterized in that, The flash evaporator (10) is further connected with a hot water circulating pump (11) connected with the heat pump unit (9).

8. The steam-free ammonia distilling and absorbing device according to claim 7, characterized in that, The hot water circulating pump (11) is further connected with a water supplement valve (12) connected with a water supplement source for supplementing water to the heat pump unit (9) through the hot water circulating pump (11).

9. The steam-free ammonia distilling and absorbing device according to claim 2, characterized in that, The tank (1) is provided with a partition plate (101) for dividing the tank (1) into two areas corresponding to an original ammonia water adding port and the steam ammonia tower (3).

10. The steam-free ammonia distilling and absorbing device according to claim 3, characterized in that, The absorption tower (6) is connected with a vacuum pump (7).

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