A spray recovery system for ammonia

Abstract

The utility model relates to exhaust gas collection and treatment technical field, concretely relates to a kind of ammonia spraying recovery system, including spraying absorption device, spraying liquid circulating device, heat exchanger.The ammonia spraying recovery system of the utility model, ammonia of production line is entered into ammonia spraying recovery system by collecting pipe, after being absorbed by spraying absorption device, by induced draft fan, it is inhaled to exhaust pipe to tail end exhaust gas treatment device and is handled, after the above treatment, ammonia is handled full quantization, with the characteristics of simple operation, energy saving and efficiency and safety, easy to realize industrialization.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas collection and treatment technology, and relates to an ammonia spray recovery system. Background Technology

[0002] Ammonia is a common industrial solvent. In the organic industry, it is often used as an amination agent, dyeing auxiliary, and catalyst. In the inorganic industry, it is frequently used to produce various salts. With the rapid development of my country's industry, the consumption of ammonia has increased dramatically. As a weakly alkaline solution, ammonia has various physicochemical properties, such as volatility and instability. It decomposes to release ammonia gas, and the higher the temperature, the faster the decomposition, potentially forming an explosive atmosphere. Therefore, the environmental problems caused by ammonia have always been a major concern.

[0003] Currently, existing technologies for ammonia absorption generally involve directly using a spray absorption tower with sulfuric acid or hydrochloric acid. This has two drawbacks: first, acid-base neutralization absorption releases heat, which is not conducive to the complete absorption of ammonia; second, the waste liquid after direct treatment has a particularly high salt content and requires evaporation treatment, which results in higher costs. Utility Model Content

[0004] Therefore, it is necessary to provide a recycling system and recycling process.

[0005] This invention addresses the shortcomings of existing technologies by proposing an ammonia spray recovery system that first recovers ammonia waste liquid, saving ammonia water and reducing downstream processing costs.

[0006] The purpose of this utility model is achieved in the following manner: an ammonia spray recovery system includes: a spray absorption device, the inlet of which is connected to an ammonia collection pipe, the spray absorption device is equipped with a spray device for spraying ammonia, and the outlet of which is connected to a waste gas treatment device through a waste gas pipe. A spray liquid circulation device is provided, wherein the spray liquid circulation device is connected to the spray absorption device through a spray liquid inlet pipe to provide spray liquid to the spray absorption device, and the spray liquid circulation device is also connected to the spray absorption device through a spray liquid recovery pipe to recover the spray liquid in the spray absorption device. A heat exchanger is connected to the spray liquid inlet pipe to cool the spray liquid. Furthermore, the spray absorption device includes a first spray absorption tower and a second spray absorption tower; the inlet of the first spray absorption tower is connected to the ammonia collection pipe, the outlet of the first spray absorption tower is connected to the inlet of the second spray absorption tower, and the outlet of the second spray absorption tower is connected to the waste gas pipe. The spray liquid circulation device is connected to the first spray absorption tower and the second spray absorption tower respectively through the spray liquid inlet pipe, so as to provide spray liquid to the first spray absorption tower and the second spray absorption tower respectively. The spray liquid circulation device is also connected to the first spray absorption tower and the second spray absorption tower respectively through the spray liquid recovery pipe, so as to recover the spray liquid in the first spray absorption tower and the second spray absorption tower respectively.

[0007] Furthermore, the spray liquid inlet pipe includes a first inlet pipe and a second inlet pipe, the spray liquid circulation device is connected to the first spray absorption tower through the first inlet pipe, and the spray liquid circulation device is connected to the second spray absorption tower through the second inlet pipe; The spray liquid recovery pipe includes a first recovery pipe and a second recovery pipe, and the spray liquid circulation device is also connected to the first spray absorption tower through the first recovery pipe, and the spray liquid circulation device is also connected to the second spray absorption tower through the second recovery pipe.

[0008] Furthermore, the outlet of the first spray absorption tower is connected to the inlet of the second spray absorption tower through a first top pipe, and the outlet of the second spray absorption tower is connected to the exhaust pipe through a second top pipe; the height of the first top pipe is not less than 20cm, and the height of the second top pipe is not less than 20cm.

[0009] Furthermore, the diameter of the first spray absorption tower is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the first spray absorption tower is not less than 2 L / m³. 3 The diameter of the second spray absorption tower is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the second spray absorption tower is not less than 2 L / m³. 3 .

[0010] Furthermore, the spray liquid circulation device includes a spray liquid circulation tank and a spray pump. The spray liquid circulation tank is connected to the first spray absorption tower through the first inlet pipe, and the spray liquid circulation tank is connected to the second spray absorption tower through the second inlet pipe. The spray liquid circulation tank is also connected to the first spray absorption tower through the first recovery pipe, and the spray liquid circulation tank is also connected to the second spray absorption tower through the second recovery pipe. The spray pump is driven to the spray liquid circulation tank to transport the spray liquid to the first spray absorption tower and the second spray absorption tower; the spray liquid circulation tank is also connected to a tap water inlet pipe and is equipped with a level gauge.

[0011] Furthermore, the ammonia spray recovery system of this utility model also includes an induced draft fan, the inlet of which is connected to the waste gas pipe, and the outlet of which is connected to the waste gas treatment device; the air pressure of the induced draft fan is 400-1000 Pa, and the air volume of the induced draft fan is 6000-7500 m³ / h. 3 / h.

[0012] Furthermore, the heat exchanger is also connected to a chilled water supply pipe and a chilled water return pipe, respectively, and the chilled water supplied by the chilled water supply pipe has a temperature of 10-30℃.

[0013] Furthermore, the ammonia spray recovery system of this utility model also includes a thermometer and a flow meter, which are located at the outlet of the spray liquid circulation device.

[0014] The beneficial effects of this utility model are: (1) The ammonia waste gas generated by the production line is often at a certain temperature. The ammonia spraying and recovery system of this utility model uses chilled water to spray the ammonia gas in two stages, which greatly ensures the solubility of ammonia in water and improves the recovery efficiency (more than 95%). It has a good cost reduction and efficiency improvement effect. (2) The ammonia spraying and recovery system of this utility model absorbs a large amount of ammonia in the waste gas with water, and can be configured with an industrial ammonia water mass fraction of more than 5% at a water temperature of about 10℃. (3) The ammonia waste gas treated by the spray recovery system of the present invention can achieve full absorption of ammonia by passing through the tail end waste gas facility, and has good economic and environmental benefits. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention. The same reference numerals in the drawings identify the same or similar parts or components. Those skilled in the art should understand that the drawings may not be drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] The reference numerals in the attached drawings are explained as follows: 001: First spray absorption tower; 002: Second spray absorption tower; 003: Spray liquid circulation tank; 004: Heat exchanger; 005: Exhaust fan; 006: First top pipe; 007: Ammonia collection pipe. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of the invention, it should be noted that the terms "whole body," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention. Furthermore, the terms "connection" and "towards" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] This utility model discloses an ammonia spray recovery system, such as... Figure 1 As shown, it includes: A spray absorption device is provided, wherein the air inlet of the spray absorption device is connected to an ammonia collection pipe 007, and a spray device is provided inside the spray absorption device for spraying ammonia. The air outlet of the spray absorption device is connected to an exhaust gas treatment device through an exhaust gas pipe. A spray liquid circulation device is provided, wherein the spray liquid circulation device is connected to the spray absorption device through a spray liquid inlet pipe to provide spray liquid to the spray absorption device, and the spray liquid circulation device is also connected to the spray absorption device through a spray liquid recovery pipe to recover the spray liquid in the spray absorption device. Heat exchanger 004 is connected to the spray liquid inlet pipe to cool the spray liquid.

[0023] In one embodiment, the spray absorption device specifically includes a first spray absorption tower 001 and a second spray absorption tower 002; the air inlet of the first spray absorption tower 001 is connected to the ammonia collection pipe 007, the air outlet of the first spray absorption tower 001 is connected to the air inlet of the second spray absorption tower 002, and the air outlet of the second spray absorption tower 002 is connected to the waste gas pipe. The spray liquid circulation device is connected to the first spray absorption tower 001 and the second spray absorption tower 002 respectively through the spray liquid inlet pipe, so as to provide spray liquid to the first spray absorption tower 001 and the second spray absorption tower 002 respectively. The spray liquid circulation device is also connected to the first spray absorption tower 001 and the second spray absorption tower 002 respectively through the spray liquid recovery pipe, so as to recover the spray liquid in the first spray absorption tower 001 and the second spray absorption tower 002 respectively.

[0024] In one embodiment, specifically, the spray liquid inlet pipe includes a first inlet pipe and a second inlet pipe, the spray liquid circulation device is connected to the first spray absorption tower 001 through the first inlet pipe, and the spray liquid circulation device is connected to the second spray absorption tower 002 through the second inlet pipe; The spray liquid recovery pipe includes a first recovery pipe and a second recovery pipe, and the spray liquid circulation device is also connected to the first spray absorption tower 001 through the first recovery pipe, and the spray liquid circulation device is also connected to the second spray absorption tower 002 through the second recovery pipe.

[0025] In one embodiment, the spraying device specifically includes a first spraying device in the first spraying absorption tower 001 and a second spraying device in the second spraying absorption tower 002. After two spraying treatments of ammonia gas, the solubility of ammonia in water is greatly guaranteed, the recovery efficiency is improved (more than 95%), and it has a good cost reduction and efficiency improvement effect.

[0026] In one embodiment, specifically, the outlet of the first spray absorption tower 001 is connected to the inlet of the second spray absorption tower 002 via a first top pipe 006, and the outlet of the second spray absorption tower 002 is connected to the exhaust pipe via a second top pipe; specifically, the height of the first top pipe 006 is not less than 20cm, and the height of the second top pipe is not less than 20cm, to meet the height of the water column corresponding to 2000pa, thereby reducing the water mist in the first spray absorption tower 001 and the second spray absorption tower 002 from entering the next component.

[0027] In one embodiment, specifically, the diameter of the first spray absorption tower 001 is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the first spray absorption tower 001 is not less than 2 L / m³. 3 The diameter of the second spray absorption tower 002 is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the second spray absorption tower 002 is not less than 2L / m³. 3 .

[0028] Specifically, the diameter of the exhaust pipe can be DN100-DN200, and the diameter of the spray absorption tower can be selected as DN500-DN1000.

[0029] In one embodiment, the spray liquid circulation device specifically includes a spray liquid circulation tank 003 and a spray pump. The spray liquid circulation tank 003 is connected to the first spray absorption tower 001 through the first inlet pipe, and the spray liquid circulation tank 003 is connected to the second spray absorption tower 002 through the second inlet pipe. Furthermore, the spray liquid circulation tank 003 is also connected to the first spray absorption tower 001 through the first recovery pipe, and the spray liquid circulation tank 003 is also connected to the second spray absorption tower 002 through the second recovery pipe. The spray pump is driven to the spray liquid circulation tank 003 to transport the spray liquid to the first spray absorption tower 001 and the second spray absorption tower 002; the spray liquid circulation tank 003 is also connected to a tap water inlet pipe, and the spray liquid circulation tank 003 is equipped with a level gauge to monitor the water level of the spray liquid circulation tank 003 in real time.

[0030] In one embodiment, specifically, the ammonia spray recovery system of this utility model further includes an induced draft fan 005, the inlet of which is connected to the waste gas pipe, and the outlet of which is connected to the waste gas treatment device. Specifically, the air pressure of the induced draft fan 005 is 400-1000 Pa, and the air volume of the induced draft fan 005 is 6000-7500 m³ / h. 3 / h.

[0031] In one embodiment, specifically, the heat exchanger 004 is also connected to a chilled water supply pipe and a chilled water return pipe; specifically, the temperature of the chilled water supplied by the chilled water supply pipe is 10-30℃.

[0032] In one embodiment, specifically, the ammonia spray recovery system of the present invention further includes a thermometer and a flow meter, which are located at the outlet of the spray liquid circulation device to monitor the parameters of the entire device in real time.

[0033] See Figure 1In one embodiment, specifically, the lower part of the first spray absorption tower 001 is connected to the ammonia collection pipe 007, and the upper part of the first spray absorption tower 001 is equipped with a first spray device, which specifically includes a first spray pipe. The first spray pipe is located at the upper part of the first spray absorption tower 001 to perform a primary spray treatment on the ammonia entering the first spray absorption tower 001. The bottom of the first spray absorption tower 001 is equipped with a first recovery pipe, and the top of the first spray absorption tower 001 is connected to a first top pipe 006. The first top pipe 006 is connected to the lower part of the second spray absorption tower 002, so that the ammonia treated by the spray in the first spray absorption tower 001 is transported to the second spray absorption tower 002 for ammonia reception through the first top pipe 006. The second spray absorption tower 002 is simultaneously equipped with a second spray device. The second spraying device specifically includes a second spray pipe, which is located at the top of the second spraying absorption tower 001 to perform secondary spraying treatment on the ammonia gas entering the second spraying absorption tower 001. A second recovery pipe is configured at the bottom of the second spraying absorption tower 001, and the top of the second spraying absorption tower 001 is connected to the exhaust gas outlet pipe. A spray liquid circulation tank 003 is configured to be connected to the first recovery pipe, the second recovery pipe, the tap water inlet pipe, and the spray pump. Specifically, the spray liquid circulation tank 003 is also equipped with a level gauge. A heat exchanger 004 is configured to be connected to the chilled water supply pipe, the chilled water return pipe, the first spray pipe, and the second spray pipe. An induced draft fan 005 is connected to the second spraying absorption tower 002 and the exhaust gas pipe. The ammonia waste gas generated by the production line can be reduced by more than 90% after passing through the ammonia spray recovery device and directly passed to the downstream waste gas treatment device. At the same time, the absorbed ammonia water can be reused in the production line.

[0034] The ammonia spray recovery system described in this invention can reduce ammonia by more than 95%, and the concentration of the recovered ammonia water can be controlled to a mass-volume fraction of more than 5% under the condition of chilled water at around 10°C.

[0035] The specific workflow of this utility model is as follows: The ammonia gas from the production line enters the ammonia gas spray recovery system through the ammonia gas collection pipe 007. It first enters the first spray absorption tower 001 for primary absorption, then enters the second spray absorption tower 002 through the first top pipe 006 for secondary absorption, and finally flows into the exhaust gas pipe through the induced draft fan 005 to the tail end exhaust gas treatment device for treatment.

[0036] The temperature of the spray liquid circulation tank 003 should be controlled between 10-30℃ to ensure that the concentration of the recovered ammonia water is above 5%. On-site monitoring and control can be carried out according to the thermometer configured in the device.

[0037] The flow rate of the spray liquid is adjusted by observing the flow meter reading to ensure that the liquid-to-gas ratio in the first spray absorption tower 001 and the second spray absorption tower 002 is 2L / m³. 3 above.

[0038] When the ammonia water in the spray liquid circulation tank 003 is close to saturation, it can be pumped to the dilute ammonia water tank for production. The spray liquid circulation tank 003 is replenished with water through a tap water pipe.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An ammonia spray recovery system, characterized in that, include: A spray absorption device is provided, wherein the air inlet of the spray absorption device is connected to an ammonia collection pipe, the spray absorption device is equipped with a spray device for spraying ammonia, and the air outlet of the spray absorption device is connected to an exhaust gas treatment device through an exhaust gas pipe. A spray liquid circulation device is provided, wherein the spray liquid circulation device is connected to the spray absorption device through a spray liquid inlet pipe to provide spray liquid to the spray absorption device, and the spray liquid circulation device is also connected to the spray absorption device through a spray liquid recovery pipe to recover the spray liquid in the spray absorption device. A heat exchanger is connected to the spray liquid inlet pipe to cool the spray liquid.

2. The ammonia spray recovery system according to claim 1, characterized in that, The spray absorption device includes a first spray absorption tower and a second spray absorption tower; the inlet of the first spray absorption tower is connected to the ammonia collection pipe, the outlet of the first spray absorption tower is connected to the inlet of the second spray absorption tower, and the outlet of the second spray absorption tower is connected to the waste gas pipe. The spray liquid circulation device is connected to the first spray absorption tower and the second spray absorption tower respectively through the spray liquid inlet pipe, so as to provide spray liquid to the first spray absorption tower and the second spray absorption tower respectively. The spray liquid circulation device is also connected to the first spray absorption tower and the second spray absorption tower respectively through the spray liquid recovery pipe, so as to recover the spray liquid in the first spray absorption tower and the second spray absorption tower respectively.

3. The ammonia spray recovery system according to claim 2, characterized in that, The spray liquid inlet pipe includes a first inlet pipe and a second inlet pipe. The spray liquid circulation device is connected to the first spray absorption tower through the first inlet pipe, and the spray liquid circulation device is connected to the second spray absorption tower through the second inlet pipe. The spray liquid recovery pipe includes a first recovery pipe and a second recovery pipe, and the spray liquid circulation device is also connected to the first spray absorption tower through the first recovery pipe, and the spray liquid circulation device is also connected to the second spray absorption tower through the second recovery pipe.

4. The ammonia spray recovery system according to claim 2, characterized in that: The outlet of the first spray absorption tower is connected to the inlet of the second spray absorption tower through a first top pipe, and the outlet of the second spray absorption tower is connected to the exhaust pipe through a second top pipe; the height of the first top pipe is not less than 20cm, and the height of the second top pipe is not less than 20cm.

5. The ammonia spray recovery system according to claim 2, characterized in that: The diameter of the first spray absorption tower is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the first spray absorption tower is not less than 2 L / m³. 3 ; The diameter of the second spray absorption tower is more than 5 times that of the waste gas pipe, and the liquid-to-gas ratio of the second spray absorption tower is not less than 2 L / m³. 3 .

6. The ammonia spray recovery system according to claim 3, characterized in that, The spray liquid circulation device includes a spray liquid circulation tank and a spray pump. The spray liquid circulation tank is connected to the first spray absorption tower through the first inlet pipe, and the spray liquid circulation tank is connected to the second spray absorption tower through the second inlet pipe. The spray liquid circulation tank is also connected to the first spray absorption tower through the first recovery pipe, and the spray liquid circulation tank is also connected to the second spray absorption tower through the second recovery pipe. The spray pump is driven to the spray liquid circulation tank to transport the spray liquid to the first spray absorption tower and the second spray absorption tower; the spray liquid circulation tank is also connected to a tap water inlet pipe and is equipped with a level gauge.

7. The ammonia spray recovery system according to claim 1, characterized in that, It also includes an induced draft fan, the air inlet of which is connected to the exhaust gas pipe, and the air outlet of which is connected to the exhaust gas treatment device. The induced draft fan has a wind pressure of 400-1000 Pa and an air volume of 6000-7500 m³ / h. 3 / h.

8. The ammonia spray recovery system according to claim 1, characterized in that, The heat exchanger is also connected to the chilled water supply pipe and the chilled water return pipe, respectively.

9. The ammonia spray recovery system according to claim 8, characterized in that: The chilled water supplied by the chilled water supply pipe has a temperature of 10-30℃.

10. The ammonia spray recovery system according to claim 1, characterized in that: It also includes a thermometer and a flow meter, which are located at the outlet of the spray liquid circulation device.

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