Ammonia water production device
By installing a circulating water system and heat exchangers in the ammonia production unit, the problem of unused heat is solved, achieving self-sufficiency and recycling of heat, thus ensuring the quality and production efficiency of ammonia.
Patent Information
- Application Number
- CN202423114285.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-17
AI Technical Summary
In the existing ammonia production process, heat is not fully utilized, resulting in resource waste and equipment damage, and the production equipment requires additional heat sources and cooling devices.
An ammonia production device was designed, comprising an ammonia absorber, a circulating water device, a liquid ammonia storage tank, a demineralized water tank, and an ammonia tank. By setting up a heat exchanger and a circulation path in the ammonia absorber, excess heat is absorbed by the circulating water, achieving self-sufficiency in heat supply and recycling.
It realizes the recycling of heat in the ammonia production process, saves energy, avoids additional heat sources and cooling devices, has a simple structure, and ensures that the temperature and concentration of ammonia water meet the requirements.
Smart Images
Figure CN223542966U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of chemical production equipment, and in particular to an ammonia water production equipment. Background Technology
[0002] Ammonia is an important chemical raw material in industrial production, widely used in fertilizers, cleaning agents, textiles, metallurgy, pharmaceuticals, and other industries. Ammonia absorbers produce ammonia water by absorbing ammonia gas and liquid ammonia. This process effectively reduces ammonia emissions, avoids environmental pollution, and allows for the recovery of ammonia gas, converting it into usable ammonia water products.
[0003] In existing ammonia production technologies, liquid ammonia is usually vaporized and then reacted with water. The heat required for the vaporization process is provided by a heat source, while the heat generated by the reaction of ammonia with water is cooled by cooling water. The heat in the entire production process is not fully utilized, which not only wastes resources but also causes certain damage to the production equipment itself. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an ammonia water production device that is self-sufficient in the heat required and generated during the production process and can be recycled.
[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: the ammonia production device includes an ammonia absorber, a circulating water device, a liquid ammonia storage tank, a demineralized water tank, and an ammonia tank. A one-way passage for liquid ammonia to enter the ammonia absorber is provided between the liquid ammonia storage tank and the ammonia absorber. A one-way passage for demineralized water to enter the ammonia absorber is provided between the demineralized water tank and the ammonia absorber. A heat exchanger is provided in the ammonia absorber. A bidirectional circulation passage is provided between the circulating water device and the heat exchanger. A one-way passage for ammonia to flow out of the ammonia absorber is provided between the ammonia tank and the ammonia absorber.
[0006] Preferably, a density meter is installed on the one-way passage of the ammonia water outflow ammonia absorber.
[0007] Preferably, a passage for low-concentration ammonia water to enter the ammonia absorber is provided between the ammonia water tank and the ammonia absorber, and a flow regulating valve and a flow meter are provided on the passage for low-concentration ammonia water to enter the ammonia absorber.
[0008] Preferably, a flow regulating valve and a flow meter are provided on the one-way passage of the demineralized water entering the ammonia absorber.
[0009] Preferably, a pressure relief pipeline is also provided between the liquid ammonia storage tank and the ammonia absorber, and the interface of the pressure relief pipeline is located between the flow regulating valve and the ammonia absorber.
[0010] Preferably, a quick-cut valve is installed on the pipeline between the liquid ammonia storage tank and the ammonia absorber.
[0011] Preferably, a drain valve is provided between the bidirectional circulation path of the circulating water device and the heat exchanger.
[0012] Compared with existing technologies, the beneficial effects of this technical solution are:
[0013] This invention utilizes a circulating path in the heat exchanger inside the ammonia absorber to recycle the heat generated when liquid ammonia meets water. The circulating water entering the heat exchanger from the circulating water device absorbs heat and then enters the circulating path, providing the necessary heat for the vaporization of liquid ammonia that directly enters the ammonia absorber. The generated ammonia reacts with the demineralized water provided by the demineralized water tank to produce ammonia water. This not only controls the temperature of the generated ammonia water but also saves energy, eliminating the need for additional heat sources and cooling devices, resulting in a simple structure. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of an ammonia production device according to the present invention.
[0015] The components include: 1. Ammonia absorber; 2. Circulating water device; 3. Liquid ammonia storage tank; 4. Demineralized water tank; 5. Ammonia water tank; 6. First passage; 7. Second passage; 8. Third passage; 9. Fourth passage; 10. First circulating passage; 11. Second circulating passage; 12. Density meter; 13. Pressure relief pipeline; 14. Pressure relief tank; 15. Drain valve. Detailed Implementation
[0016] Figure 1 This is the preferred embodiment of the present invention, which is described below in conjunction with the appendix. Figure 1 The present invention will be further described below.
[0017] Reference Figure 1 The ammonia production device includes an ammonia absorber 1, a circulating water device 2, a liquid ammonia storage tank 3, a demineralized water tank 4, and an ammonia water tank 5. A one-way passage for liquid ammonia to enter the ammonia absorber 1 is provided between the liquid ammonia storage tank 3 and the ammonia absorber 1. A one-way passage for demineralized water to enter the ammonia absorber 1 is provided between the demineralized water tank 4 and the ammonia absorber 1. A heat exchanger is provided in the ammonia absorber 1. A two-way circulation passage is provided between the circulating water device 2 and the heat exchanger. A one-way passage for ammonia water to flow out of the ammonia absorber 1 is provided between the ammonia water tank 5 and the ammonia absorber 1.
[0018] The one-way passage between the liquid ammonia storage tank 3 and the ammonia absorber 1 is the first passage 6. The first passage 6 is equipped with a quick-cut valve and a flow meter. The liquid ammonia in the liquid ammonia storage tank 3 enters the ammonia absorber 1 after pressure reduction. The flow meter is adjusted to make its flow rate reach 3t / h.
[0019] The demineralized water in the demineralized water tank 4 enters the ammonia absorber 1 through the second passage 7. The second passage 7 is equipped with a flow regulating valve and a flow meter to regulate the flow rate of the demineralized water into the ammonia absorber 1.
[0020] When liquid ammonia encounters demineralized water, a large amount of heat is released. This heat causes a portion of the liquid ammonia to vaporize. The vaporized ammonia dissolves in water to prepare ammonia water. The vaporization of liquid ammonia requires heat absorption, but the heat released by the liquid ammonia and demineralized water is far greater than the heat absorbed by the liquid ammonia during vaporization. Excessive heat will increase the temperature and decrease the concentration of the prepared ammonia water. This invention addresses this by setting up a circulating water system connected to a heat exchanger. The heat exchanger absorbs the excess heat and carries it out of the ammonia absorber 1 through the circulating water, ensuring that the heat inside the ammonia absorber 1 is stable and that the prepared ammonia water has a suitable temperature and qualified concentration.
[0021] In this embodiment, the circulating water device 2 is a cooling tower. The demineralized water in the cooling tower enters the ammonia absorber 1 and absorbs heat before entering the circulation path. The hot demineralized water flows out of the ammonia absorber 1 from the first circulation path 10, and after temperature adjustment, it flows into the ammonia absorber 1 from the second circulation path 11. This ensures that the temperature in the ammonia absorber 1 is always kept balanced, which can meet the heat required for liquid ammonia vaporization without making the temperature of the ammonia water too high, resulting in an unqualified concentration.
[0022] The internal structure of the ammonia absorber 1 is equipped with a plate heat exchanger, which is beneficial to improving heat exchange efficiency. The heat exchanger consists of multiple corrugated plates that form staggered flow channels, allowing liquid ammonia and circulating water to flow in different channels, thus achieving effective heat exchange.
[0023] Ammonia solution of the correct concentration in ammonia absorber 1 enters ammonia tank 5 through third passage 8. Third passage 8 is equipped with a density meter 12 to determine the ammonia concentration in ammonia tank 5. When the ammonia concentration is unsuitable, the ammonia solution in ammonia tank 5 enters ammonia absorber 1 through a circulation pump. This circulation passage is fourth passage 9, which is equipped with a flow regulating valve and a flow meter to adjust the flow rate of ammonia solution entering ammonia absorber 1.
[0024] A pressure relief pipeline 13 is also provided between the liquid ammonia storage tank 3 and the ammonia absorber 1. The interface of the pressure relief pipeline 13 is located between the flow regulating valve and the ammonia absorber 1. When the pressure of the liquid ammonia storage tank 3 is too high, part of the liquid ammonia is transported to the pressure relief tank 14 through the pressure relief pipeline 13 to ensure that the pressure of the liquid ammonia storage tank 3 is normal.
[0025] A drain valve 15 is provided between the bidirectional circulation path of the circulating water device 2 and the heat exchanger. When this set of production equipment is not in use, the circulating water in the circulating water device 2 is released through the drain valve 15 to ensure the performance of the circulating water device 2.
[0026] During the above-mentioned process of fully absorbing ammonia and water, the flow rate of liquid ammonia and demineralized water entering the ammonia absorber 1 can be remotely adjusted by DCS, the online density count value can be monitored, and the density and concentration comparison table can be consulted to obtain the concentration of the prepared ammonia water in real time. Thus, the required concentration of ammonia water can be formed in one injection by injecting a set amount of liquid ammonia and demineralized water.
[0027] In addition, the ammonia preparation process involves several potential risks, including ammonia leakage, high-temperature and high-pressure operating conditions, and fire and explosion risks. The following is an analysis of these risks and corresponding countermeasures:
[0028] 1. Ammonia leakage risk:
[0029] Ammonia has an irritating odor, and leaks can cause respiratory irritation and chemical burns, and in severe cases, suffocation and death.
[0030] Countermeasures: Install leak detection ports at the bottom of the ammonia absorber; any liquid leakage indicates a potential leak. Simultaneously, install gas detectors on-site, linked to the gas leak alarm system in the central control room for monitoring. Regularly inspect the integrity of equipment and pipelines, and organize safety training and emergency drills for employees.
[0031] 2. Risks associated with high-temperature and high-pressure operation:
[0032] High temperatures and high pressures can cause equipment and pipes to rupture or leak.
[0033] Countermeasures: Strictly follow operating procedures, establish a DCS safety monitoring and early warning system, and strengthen the inspection and maintenance of equipment and pipelines.
[0034] 3. Fire and explosion risks:
[0035] Ammonia is flammable and explosive, and contact with a source of ignition may cause fires and explosions.
[0036] Countermeasures: Smoking and open flames are strictly prohibited. Explosion-proof equipment must be used, and good ventilation must be ensured.
[0037] 4. Corrosion risks of equipment and pipelines:
[0038] Corrosion may cause ammonia leakage.
[0039] Countermeasures: Use corrosion-resistant materials and regularly inspect and replace equipment and pipes.
[0040] 5. Risk of improper operation:
[0041] Improper handling may lead to ammonia leakage or other accidents.
[0042] Countermeasures: Establish strict operating procedures and train operators.
[0043] 6. Environmental risks:
[0044] Ammonia leaks can cause environmental pollution.
[0045] Response measures: Establish two systems and formulate emergency plans.
[0046] 7. Ammonia concentration control:
[0047] Inaccurate ammonia concentration may cause process problems.
[0048] Countermeasures: Use online monitoring equipment and perform regular manual calibration.
[0049] 8. Compliance with environmental regulations:
[0050] The preparation of ammonia must comply with environmental regulations.
[0051] Response measures: Ensure all emissions meet environmental standards and that waste ammonia recycling complies with regulations.
[0052] The above measures can effectively control the risks in the process of preparing ammonia water through ammonia absorber 1, ensuring production safety and environmental protection.
[0053] Work process:
[0054] 1. Open the valve between the demineralized water tank 4 and the ammonia absorber 1. The demineralized water enters the ammonia absorber 1. Control the liquid level of the demineralized water in the ammonia absorber 1 by controlling the regulating valve, flow valve, etc. Taking the production of 15% concentration ammonia water by the 3000 type ammonia absorber 1 as an example, the flow rate of the demineralized water is controlled at 8 tons / hour.
[0055] 2. Liquid ammonia enters the ammonia absorber 1 from the liquid ammonia storage tank 3. Taking the production of 15% concentration ammonia water by the 3000 type ammonia absorber 1 as an example, the liquid ammonia flow rate is controlled at 3 tons / hour entering the ammonia absorber 1. At this time, the concentration of ammonia water should be exactly 15%. When liquid ammonia meets demineralized water, it releases a large amount of heat. Some of the heat causes the liquid ammonia to vaporize. After vaporization, the liquid ammonia dissolves in water to form ammonia water. The heat released by the reaction of liquid ammonia and water is much greater than the heat required for the vaporization of liquid ammonia. The excess heat causes the temperature of the ammonia water to rise and the concentration to drop.
[0056] 3. Open the valve between the circulating water device 2 and the ammonia absorber 1 to allow circulating water to enter the heat exchanger in the ammonia absorber 1. The heat exchanger absorbs the excess heat and enters the circulating water, maintaining the heat balance in the ammonia absorber 1. The circulating water sends hot circulating water into the circulating water device 2 through the circulating pipeline. After temperature adjustment, the cool circulating water is sent into the heat exchanger, thereby regulating the heat balance in the ammonia absorber 1 and allowing liquid ammonia to continuously vaporize and dissolve in water without the need for an additional heating device.
[0057] 4. The prepared ammonia water is sent into ammonia water tank 5. A density meter and temperature transmitter are installed on the ammonia water outlet passage. The density value is transmitted remotely through DCS, and the ammonia water concentration is confirmed by referring to the density concentration comparison table.
[0058] 5. The exhaust gas discharged from the ammonia tank 5 is recovered by the tail gas absorber, and is discharged only after the recovered gas meets the standards.
[0059] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from its technical solution shall still fall within the protection scope of this utility model.
Claims
1. An ammonia water production apparatus, characterized in that: It includes an ammonia absorber (1), a circulating water device (2), a liquid ammonia storage tank (3), a demineralized water tank (4), and an ammonia water tank (5). A one-way passage for liquid ammonia to enter the ammonia absorber (1) is provided between the liquid ammonia storage tank (3) and the ammonia absorber (1). A one-way passage for demineralized water to enter the ammonia absorber (1) is provided between the demineralized water tank (4) and the ammonia absorber (1). A heat exchanger is provided in the ammonia absorber (1). A two-way circulation passage is provided between the circulating water device (2) and the heat exchanger. A one-way passage for ammonia water to flow out of the ammonia absorber (1) is provided between the ammonia water tank (5) and the ammonia absorber (1).
2. The ammonia water production apparatus according to claim 1, characterized in that: A density meter (12) is provided on the one-way passage of the ammonia water outflow ammonia absorber (1).
3. An ammonia water production apparatus according to claim 2, characterized in that: A passage for low-concentration ammonia water to enter the ammonia absorber (1) is provided between the ammonia water tank (5) and the ammonia absorber (1). A flow regulating valve and a flow meter are provided on the passage for low-concentration ammonia water to enter the ammonia absorber (1).
4. An ammonia water production apparatus according to claim 1, characterized in that: The demineralized water entering the ammonia absorber (1) is provided with a flow regulating valve and a flow meter.
5. An ammonia water production apparatus according to claim 1, characterized in that: The liquid ammonia storage tank (3) and the ammonia absorber (1) are also provided with a pressure relief pipeline (13), and the interface of the pressure relief pipeline (13) is located between the flow regulating valve and the ammonia absorber (1).
6. An ammonia water production apparatus according to claim 1, characterized in that: A quick-cut valve is provided on the pipeline between the liquid ammonia storage tank (3) and the ammonia absorber (1).
7. An ammonia water production apparatus according to claim 1, characterized in that: A drain valve (15) is provided between the bidirectional circulation passage between the circulating water device (2) and the heat exchanger.