Low-energy-consumption ammonia water preparation device

Abstract

The utility model relates to a low-energy-consumption ammonia water preparation device, which comprises a liquid ammonia-high-temperature chilled water heat exchanger, a cooling water-high-temperature ammonia water heat exchanger and an ammonia gas-water mixing absorption chamber, and a cooling water outlet A and a cooling water inlet A are respectively arranged above and below the liquid ammonia-high-temperature chilled water heat exchanger. A cooling water outlet B and a cooling water inlet B are formed in the two sides of the cooling water-high-temperature ammonia water heat exchanger respectively, the cooling water inlet B is connected with the cooling water outlet A. A liquid ammonia inlet and a gas ammonia outlet are formed in the two sides of the liquid ammonia-high-temperature chilled water heat exchanger respectively, and a gas ammonia inlet is formed in the top of the ammonia gas-water mixing absorption chamber. The gas ammonia inlet is connected with the gas ammonia outlet, and a stronger ammonia water outlet is arranged below the cooling water-high temperature ammonia water heat exchanger. The device is simple in structure, reasonable in design and convenient to use, energy consumption in the production process is reduced while the capacity and the quality of ammonia water are guaranteed, the problems of high energy consumption in high-power operation of the ice maker, insufficient gas ammonia absorption process and the like are solved, and cost reduction and efficiency improvement are effectively realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of low-energy consumption ammonia water device. BACKGROUND

[0002] Ammonia water can be used as ammonia material, refrigerant, solvent, etc. in the national defense industry, textile industry, etc. Ammonia water is heated to 800-850 ℃, and ammonia is decomposed under the action of nickel-based catalyst to obtain 75% H2+25% N2 hydrogen-nitrogen mixed gas, which is a good protective gas and can be widely used in semiconductor industry, metallurgical industry, and other industries and scientific research.

[0003] The existing ammonia water device is suitable for the following production process: ① ammonia water production by gaseous ammonia: ultra-pure ammonia is prepared by using crude liquid ammonia as raw material, removing heavy and light impurities by rectification, and then dissolving ammonia gas in water. In the prior art, a large amount of heat generated by the dissolution of ammonia gas needs to be cooled by cold water, which not only consumes a large amount of refrigerated water, but also wastes heat, which is not conducive to energy saving and emission reduction. ② ammonia water production by liquid ammonia: liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with strong irritating odor. It is an important industrial raw material and is widely used in pharmaceutical, oil refining, synthetic fiber, synthetic resin, refrigeration, metallurgy and other industries. Directly producing ammonia water from liquid ammonia will also release a large amount of heat that needs to be cooled, and the cooling medium for the ammonia absorber in the ammonia water production process is -5 ℃ refrigerated water produced by an ice machine or 7 ℃ water produced by a water unit, which has high energy consumption and high maintenance cost of the ice machine. SUMMARY

[0004] The utility model improves the above problems, i.e., the technical problem to be solved by the utility model is to provide a low-energy consumption ammonia water device, which is convenient to use, and the cooling medium is changed to circulating cooling water. In the ammonia water production process, the cooling water is used instead of -5 ℃ refrigerated water or 7 ℃ water produced by a water unit, which can ensure the production capacity and quality of ammonia water while saving energy and reducing consumption.

[0005] The utility model is constituted as follows: it comprises a liquid ammonia-high temperature refrigerated water heat exchanger, a cooling water-high temperature ammonia water heat exchanger, and an ammonia gas-water mixed absorption chamber arranged at the top of the cooling water-high temperature ammonia water heat exchanger. The upper and lower parts of the liquid ammonia-high temperature refrigerated water heat exchanger are respectively provided with a cooling water outlet A and a cooling water inlet A. The two sides of the cooling water-high temperature ammonia water heat exchanger are respectively provided with a cooling water outlet B and a cooling water inlet B. The cooling water inlet B is connected with the cooling water outlet A. The two sides of the liquid ammonia-high temperature refrigerated water heat exchanger are respectively provided with a liquid ammonia inlet and a gaseous ammonia outlet. The top of the ammonia gas-water mixed absorption chamber is provided with a gaseous ammonia inlet. The gaseous ammonia inlet is connected with the gaseous ammonia outlet. The lower part of the cooling water-high temperature ammonia water heat exchanger is provided with a concentrated ammonia water outlet.

[0006] Further, the ammonia-water mixed absorption chamber is provided with a process water inlet.

[0007] Further, the ammonia outlet of the liquid ammonia-high temperature chilled water heat exchanger is also connected with the ammonia tail gas outlet of the external rectification tower.

[0008] Further, the cooling water inlet A is provided with a cooling water feeding pipeline, the cooling water outlet A is connected with the cooling water inlet B through a cooling water connecting pipeline, and the cooling water outlet B is provided with a cooling water discharging pipeline.

[0009] Further, the liquid ammonia inlet is provided with a liquid ammonia feeding pipeline.

[0010] Further, the ammonia outlet is provided with an ammonia connecting pipeline, and the ammonia tail gas outlet of the rectification tower is connected with the ammonia connecting pipeline through an ammonia tail gas feeding pipeline.

[0011] Further, the cooling water outlet B is arranged above the left side of the cooling water-high temperature ammonia water heat exchanger, and the cooling water inlet B is arranged below the right side of the cooling water-high temperature ammonia water heat exchanger.

[0012] Further, the liquid ammonia inlet is arranged below the right side of the liquid ammonia-high temperature chilled water heat exchanger, and the ammonia outlet is arranged above the left side of the liquid ammonia-high temperature chilled water heat exchanger.

[0013] Further, the concentrated ammonia water outlet is provided with a concentrated ammonia water discharging pipeline.

[0014] Further, the process water inlet is provided with a process water inlet pipeline.

[0015] Compared with the prior art, this utility model has the following advantages: The device has a simple structure and reasonable design. Cooling water enters the liquid ammonia-cooling water heat exchanger from the bottom, utilizing the heat absorption characteristic of liquid ammonia vaporization to exchange heat with it, thus lowering the cooling water temperature. The vaporized ammonia exits from the gaseous ammonia outlet on the upper left side of the liquid ammonia-cooling water heat exchanger and merges with the ammonia tail gas from the distillation column, entering the ammonia-water mixing absorption chamber from the top. Cooling water flows out from the top of the liquid ammonia-cooling water heat exchanger, flows in from the bottom right side of the cooling water-high-temperature ammonia water heat exchanger, and finally exits from the cooling water outlet B on the left side of the cooling water-high-temperature ammonia water heat exchanger. A process water inlet is located on the left side of the ammonia-water mixing absorption chamber. The ammonia water produced by dissolving gaseous ammonia in process water is directly discharged from the concentrated ammonia water outlet at the bottom of the cooling water-high-temperature ammonia water heat exchanger. By modifying the internal structure of the ammonia absorber, the inlet of the cooling medium (cooling water inlet A) is moved from the bottom left side of the original cooling water-high temperature ammonia heat exchanger to the bottom of the liquid ammonia-cooling water heat exchanger. This allows the cooling water to exchange heat with the liquid ammonia vaporization process, reducing the cooling water temperature and eliminating the need for the refrigeration process. The outlet of the cooling medium (cooling water outlet B) is moved from the bottom of the original liquid ammonia-high temperature chilled water heat exchanger to the upper left side of the cooling water-high temperature ammonia heat exchanger. The cooled water can then exchange heat with the gaseous ammonia dissolution process, improving the gaseous ammonia dissolution efficiency. This approach reduces energy consumption during ammonia production while maintaining ammonia production capacity and quality. It also lowers the chilled water temperature, eliminates the need for the refrigeration process, and reduces the energy consumption of the high-power ice machine, achieving energy conservation and emission reduction with significant economic benefits. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Example 1: As Figure 1 As shown in this embodiment, a low-energy ammonia water production device is provided, including a liquid ammonia-high-temperature chilled water heat exchanger 2, a cooling water-high-temperature ammonia water heat exchanger 1, and an ammonia-water mixing absorption chamber 3 disposed on the top of the cooling water-high-temperature ammonia water heat exchanger. The liquid ammonia-high-temperature chilled water heat exchanger is provided with a cooling water outlet A and a cooling water inlet A at its top and bottom, respectively. The cooling water-high-temperature ammonia water heat exchanger is provided with a cooling water outlet B and a cooling water inlet B on its sides, respectively. The cooling water inlet B is connected to the cooling water outlet A. The liquid ammonia-high-temperature chilled water heat exchanger is provided with a liquid ammonia inlet and a gaseous ammonia outlet on its sides, respectively. The ammonia-water mixing absorption chamber is provided with a gaseous ammonia inlet at its top, which is connected to the gaseous ammonia outlet. A concentrated ammonia water outlet is provided at the bottom of the cooling water-high-temperature ammonia water heat exchanger.

[0019] Working time: cooling water enters the liquid ammonia-cooling water heat exchanger from the bottom, exchanges heat with the liquid ammonia by using the heat absorption characteristics of the vaporization of the liquid ammonia, reduces the temperature of the cooling water, and the vaporized ammonia is discharged from the gas ammonia outlet on the left side of the upper part of the liquid ammonia-cooling water heat exchanger, and is combined with the ammonia tail gas of the rectification tower into a path entering the ammonia gas-water mixed absorption chamber from the top, the cooling water flows out from the top of the liquid ammonia-cooling water heat exchanger, flows into the cooling water-high temperature ammonia water heat exchanger from the right side of the bottom of the cooling water-high temperature ammonia water heat exchanger, and is finally discharged from the cooling water outlet B on the left side of the cooling water-high temperature ammonia water heat exchanger, and the left side of the ammonia gas-water mixed absorption chamber is provided with a process water inlet, and the ammonia water prepared by dissolving the gas ammonia in the process water is directly discharged from the concentrated ammonia water outlet at the bottom of the cooling water-high temperature ammonia water heat exchanger.

[0020] The device for preparing ammonia water provided in the embodiment uses inexpensive circulating cooling water to replace the-5 DEG C refrigerated water or 7 DEG C water unit cooling water prepared by an ice machine, the inlet and outlet positions of the cooling water are improved, heat exchange is utilized to improve energy utilization rate, the energy consumption of high-power operation of the ice machine is reduced, and the energy consumption of the ammonia water production process is reduced.

[0021] Specifically, the device replaces the original cooling medium, the-5 DEG C refrigerated water or 7 DEG C water unit cooling water, with circulating cooling water, reduces the energy consumption of high-power operation of the ice machine, changes the inlet of the cooling medium (the cooling water inlet A) from the left side of the bottom of the cooling water-high temperature ammonia water heat exchanger to the bottom of the liquid ammonia-cooling water heat exchanger, so that the cooling water can exchange heat with the liquid ammonia vaporization process, reduce the temperature of the cooling water, and cancel the ice machine refrigeration process, and changes the outlet of the cooling medium (the cooling water outlet B) from the bottom of the liquid ammonia-high temperature refrigerated water heat exchanger to the left side of the upper part of the cooling water-high temperature ammonia water heat exchanger, so that the cooling water after temperature reduction can exchange heat with the gas ammonia dissolution heat release process, improve the gas ammonia dissolution efficiency, reduce the energy consumption of the ammonia water production process while ensuring the ammonia water production capacity and quality.

[0022] In the embodiment of the utility model, the ammonia gas-water mixed absorption chamber is provided with a process water inlet on the side thereof.

[0023] In the embodiment of the utility model, the gas ammonia outlet of the liquid ammonia-high temperature refrigerated water heat exchanger is also connected with the ammonia tail gas outlet of the rectification tower arranged outside.

[0024] The gas ammonia outlet and the gas ammonia inlet are provided with a gas ammonia connecting pipeline 5, and the ammonia tail gas outlet of the rectification tower and the gas ammonia connecting pipeline are connected through an ammonia tail gas feeding pipeline 6.

[0025] In the embodiment of the utility model, the cooling water inlet A is provided with a cooling water feeding pipeline 7, the cooling water outlet A and the cooling water inlet B are connected through a cooling water connecting pipeline 8, and the cooling water outlet B is provided with a cooling water discharging pipeline 9.

[0026] In the embodiment of the utility model, the liquid ammonia inlet is provided with a liquid ammonia feeding pipeline.

[0027] In the embodiment of the utility model, the cooling water outlet B is arranged above the left side of the cooling water-high temperature ammonia water heat exchanger, and the cooling water inlet B is arranged below the right side of the cooling water-high temperature ammonia water heat exchanger.

[0028] In the embodiment of the utility model, the liquid ammonia inlet is arranged below the right side of the liquid ammonia-high temperature chilled water heat exchanger, and the gaseous ammonia outlet is arranged above the left side of the liquid ammonia-high temperature chilled water heat exchanger.

[0029] In the embodiment of the utility model, the concentrated ammonia water outlet is provided with a concentrated ammonia water discharging pipeline 10.

[0030] In the embodiment of the utility model, on the basis of example 1, the liquid ammonia enters through the liquid ammonia inlet at the bottom right side of the liquid ammonia-cooling water heat exchanger, is vaporized to obtain gaseous ammonia, and the vaporization process exchanges heat with the circulating cooling water to cool the cooling water; the gaseous ammonia enters the top of the ammonia water-water mixed absorption chamber, is fully dissolved with process water under the heat exchange effect of the cooling water to generate concentrated ammonia water, and finally the concentrated ammonia water is discharged through the concentrated ammonia water outlet at the bottom of the cooling water and high temperature ammonia water heat exchanger.

[0031] In the embodiment of the utility model, on the basis of example 1, the ammonia tail gas of the rectification tower enters through the gaseous ammonia inlet at the top of the ammonia gas-water mixed absorption chamber, and the liquid ammonia ammonia water and the gaseous ammonia ammonia water are combined.

[0032] In the embodiment of the utility model, on the basis of example 1, the circulating cooling water flow rate of the liquid ammonia-cooling water heat exchanger bottom inlet is set to 70 tons / hour, the outlet water temperature of the cooling water after being cooled by the liquid ammonia-cooling water heat exchanger is 20.1 DEG C, the return water temperature of the cooling water discharged by the cooling water-high temperature ammonia water heat exchanger is 22.3 DEG C, the ammonia water yield (20% concentration) reaches 5 tons / hour, the cooling tower water pump power is 7.5kW, the cooling tower fan is 2.2kW, the overall heat load is 646800kJ, and the power consumption per ton of ammonia water after using the circulating cooling water is 9.7kW·h.

[0033] Unless otherwise stated, if the above-mentioned utility model discloses any technical scheme, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that the preferred numerical range is only one of the many implementable numbers with more obvious technical effects or representative numbers. Since there are too many numbers, it is impossible to enumerate, therefore, the utility model only discloses part of the numbers to illustrate the technical scheme of the utility model, and the above-mentioned enumerated numbers should not constitute a limitation on the protection scope of the utility model.

[0034] Meanwhile, if the above-mentioned utility model discloses or involves mutually fixed connecting parts or structural members, then, except for another declaration, the fixed connection can be understood as: the fixed connection of detachable (for example, the connection of bolt or screw), and also can be understood as: the fixed connection of undetachable (for example, riveting, welding), of course, the mutually fixed connection can be replaced by integral structure (for example, the integral forming manufacturing of using casting process) (except for obviously unable to adopt integral forming process).

[0035] In addition, the meaning of the term used for indicating the position relationship or shape in any technical solution disclosed by the above-mentioned utility model includes the state or shape similar, analogous or close to it, except for another declaration.

[0036] Any component provided by the utility model can be assembled by multiple separate components, or can be a separate component manufactured by integral forming process.

[0037] Finally, it should be explained that: the above examples are only used to illustrate the technical solutions of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the utility model, they should be covered in the technical solution range of the utility model claimed by the utility model.

Claims

1. A low energy consumption water-ammonia plant, characterized in that, The device comprises a liquid ammonia-high temperature chilled water heat exchanger, a cooling water-high temperature ammonia water heat exchanger, and an ammonia gas-water mixed absorption chamber arranged on the top of the cooling water-high temperature ammonia water heat exchanger.

2. The low energy consumption device for producing ammonia water according to claim 1, wherein The ammonia gas-water mixed absorption chamber is provided with a process water inlet on the side.

3. The low energy consumption device for producing ammonia water according to claim 1, wherein The ammonia tail gas outlet of the rectifying tower is connected with the ammonia gas outlet of the liquid ammonia-high temperature chilled water heat exchanger through an ammonia tail gas feeding pipe.

4. The low energy consumption device for producing ammonia water according to claim 1, wherein The cooling water inlet A is provided with a cooling water feeding pipe.

5. The device for producing ammonia water with low energy consumption according to claim 1, wherein The liquid ammonia inlet is provided with a liquid ammonia feeding pipe.

6. The low energy consumption device for producing ammonia water according to claim 3, wherein The ammonia gas outlet and the ammonia gas inlet are provided with an ammonia connecting pipe, and the ammonia tail gas outlet of the rectifying tower is connected with the ammonia connecting pipe through an ammonia tail gas feeding pipe.

7. The device for producing ammonia water with low energy consumption according to claim 1, wherein The cooling water outlet B is arranged above the left side of the cooling water-high temperature ammonia water heat exchanger, and the cooling water inlet B is arranged below the right side of the cooling water-high temperature ammonia water heat exchanger.

8. The device for producing ammonia water with low energy consumption according to claim 1, wherein The liquid ammonia inlet is arranged below the right side of the liquid ammonia-high temperature chilled water heat exchanger, and the ammonia gas outlet is arranged above the left side of the liquid ammonia-high temperature chilled water heat exchanger.

9. The device for producing ammonia water with low energy consumption according to claim 1, wherein The ammonia water outlet is provided with an ammonia water discharging pipe.

10. The low energy consumption device for producing ammonia water according to claim 2, wherein The process water inlet is provided with a process water inlet pipe. The ammonia gas outlet and the ammonia gas inlet are provided with an ammonia connecting pipe, and the ammonia tail gas outlet of the rectifying tower is connected with the ammonia connecting pipe through an ammonia tail gas feeding pipe.

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