A liquid ammonia to ammonia water mixer

Abstract

The present application provides a liquid ammonia to ammonia water mixer, which relates to the field of air pollutant treatment technology, including a shell and a Laval nozzle, an ammonia inlet is arranged on the side of the body, a Laval nozzle is arranged in the shell, a softened water inlet and a dilute ammonia solution outlet of the Laval nozzle are respectively connected to the first open end and the second open end of the shell, an annular cavity is formed between the shell and the Laval nozzle, and the ammonia inlet is connected to the annular cavity, a plurality of injection holes are arranged on the side of the Laval nozzle close to the dilute ammonia solution outlet, and the injection holes connect the annular cavity with the inside of the Laval nozzle, softened water enters the Laval nozzle from the softened water inlet, liquid ammonia or ammonia gas enters the annular cavity from the liquid ammonia / ammonia gas inlet, and then enters the Laval nozzle through a plurality of injection holes, and is well mixed with softened water to obtain low-concentration ammonia water. The present application has the remarkable characteristics of simple equipment, small overall investment, simple operation, low energy consumption, and long equipment life.

Description

Technical Field

[0001] The present application relates to the technical field of air pollutant control, and in particular to a liquid ammonia to ammonia water mixer. Background Art

[0002] Ammonia water made from liquid ammonia, also known as anhydrous ammonia, is a colorless liquid. Liquid ammonia is obtained by pressurizing or cooling gaseous ammonia through certain means.

[0003] The most commonly used equipment for producing ammonia water from liquid ammonia is the ammonia absorber. The technology of ammonia absorber is mature, but it has problems such as complex equipment structure, many supporting equipment, and high construction cost. It is obviously not the best choice for usage scenarios where low concentration of dilute ammonia water is required and small usage is required. Utility Model Content

[0004] The embodiment of the present application provides a liquid ammonia to ammonia water mixer, which can achieve the following remarkable features in the production of low-concentration ammonia water required by liquid ammonia, such as simple equipment, small overall investment, simple operation, low energy consumption, long equipment life, and strong adaptability. It solves the problem that the current liquid ammonia to ammonia water equipment has a complex structure, a large number of supporting equipment, a high construction cost, and is not suitable for use scenarios with low requirements for dilute ammonia water concentration and small usage.

[0005] The embodiment of the present application provides a liquid ammonia to ammonia water mixer, comprising a shell and a Laval nozzle;

[0006] The shell has a first open end and a second open end opposite to each other, and an ammonia inlet is provided on a side of the shell;

[0007] The Laval nozzle is disposed in the shell, and the two ends of the Laval nozzle are respectively a softened water inlet and a dilute ammonia solution outlet, and the softened water inlet and the dilute ammonia solution outlet of the Laval nozzle are respectively connected to the first open end and the second open end of the shell;

[0008] An annular cavity is formed between the shell and the Laval nozzle, and the ammonia inlet is connected to the annular cavity; a plurality of injection holes are provided on the side of the Laval nozzle close to the outlet of the dilute ammonia solution, and the injection holes connect the annular cavity with the interior of the Laval nozzle; softened water enters the Laval nozzle from the softened water inlet, liquid ammonia or ammonia gas enters the annular cavity from the ammonia inlet, and then enters the Laval nozzle through the plurality of injection holes, and is well mixed with the softened water to obtain low-concentration ammonia water.

[0009] In a feasible implementation, the plurality of injection holes are evenly distributed around the central axis of the Laval nozzle;

[0010] The inner end of the injection hole is inclined toward the outlet side of the dilute ammonia solution.

[0011] In a feasible implementation, a mixing mechanism is provided on the inner wall of the Laval nozzle on the outlet side of the dilute ammonia solution;

[0012] The mixing mechanism is an X-shaped mixing blade.

[0013] In a feasible implementation, a first filter assembly is provided on the inner wall of the softened water inlet side of the Laval nozzle.

[0014] In a feasible implementation, the liquid ammonia to ammonia water mixer further includes a branch pipe body;

[0015] The branch pipe body is connected to the ammonia inlet, and the outer end of the branch pipe body is a liquid ammonia / ammonia gas inlet.

[0016] In a feasible implementation, a second filter assembly is provided on the inner wall of the branch pipe body at the liquid ammonia / ammonia gas inlet side.

[0017] In a feasible implementation, a first flange is provided at the outer end of the branch pipe body.

[0018] In a feasible implementation, the first open end and the second open end of the shell are both provided with a second flange.

[0019] The embodiment of the present application provides a mixer for preparing ammonia water from liquid ammonia, wherein an ammonia inlet is arranged on the side of a shell, a Laval nozzle is arranged in the shell, a softened water inlet and a dilute ammonia solution outlet of the Laval nozzle are respectively connected to a first open end and a second open end of the shell, an annular cavity is formed between the shell and the Laval nozzle, and the ammonia inlet is connected to the annular cavity, a plurality of injection holes are arranged on the side of the Laval nozzle close to the outlet of the dilute ammonia solution, and the injection holes connect the annular cavity with the inside of the Laval nozzle, softened water enters the Laval nozzle from the softened water inlet, liquid ammonia or ammonia gas enters the annular cavity from the liquid ammonia / ammonia gas inlet, and then enters the Laval nozzle through the plurality of injection holes, and is well mixed with the softened water to obtain low-concentration ammonia water;

[0020] The present application can achieve the remarkable characteristics of simple equipment, small overall investment, simple operation, low energy consumption, long equipment life, etc. in the production of low-concentration ammonia water requiring liquid ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a front cross-sectional view of the liquid ammonia to ammonia water mixer provided in the present application;

[0022] Figure 2 is a side cross-sectional view of a liquid ammonia to ammonia water mixer;

[0023] Figure 3 This is a schematic diagram of the use status of a liquid ammonia to ammonia water mixer.

[0024] Description of reference numerals:

[0025] 10-housing; 20-Laval nozzle; 30-annular cavity; 40-X-type mixing blade; 50-first filter assembly; 60-branch body; 70-second filter assembly; 80-first flange; 90-second flange;

[0026] 21-softened water inlet; 22-dilute ammonia solution outlet; 23-injection hole; 61-liquid ammonia / ammonia gas inlet. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present application.

[0028] Liquid ammonia is an extremely important raw material for desulfurization and denitrification in power plants, but its strong pungent smell can cause damage and pollution to the human body and the environment. Ammonia is usually inhaled into the human body in the form of gas. After inhaling a large amount of ammonia in a short period of time, tears, sore throat, coughing, chest tightness, breathing difficulties, fatigue and vomiting will occur. If excessive ammonia is inhaled, the ammonia concentration in the blood is too high, which will be life-threatening. Therefore, my country manages liquid ammonia as a major hazard source. The "Hazardous Chemicals Catalog" stipulates that ammonia solutions with ammonia content of more than 20% are hazardous chemicals.

[0029] When ammonia is mixed with air to a certain ratio, it can cause an explosion when exposed to open flames. It will cause violent chemical reactions when in contact with fluorine, chlorine, etc. If the liquid ammonia container is exposed to high heat, the internal pressure will increase and there will be a risk of cracking and explosion. In Article 4 of the Order No. 40 of the State Administration of Work Safety, "Dangerous chemical units are the responsible entities for the safety management of major hazardous sources in their units. Their main responsible persons are responsible for the safety management of major hazardous sources in their units and ensure the necessary safety investment for the production safety of major hazardous sources" and Article 6 "The state encourages dangerous chemical units to adopt advanced and applicable processes, technologies, equipment and automatic control systems that are conducive to improving the safety level of major hazardous sources, and promote the informatization of safety supervision of major hazardous sources in production safety supervision and management", there are relevant provisions, so it is still necessary to invest in corresponding safety technology for liquid ammonia storage tanks.

[0030] The most commonly used process for producing ammonia water from liquid ammonia is to use an ammonia absorber. The technology of ammonia absorbers is mature, but the equipment has complex structure, many supporting equipment, and high construction cost. It is obviously not the best choice for the use scenario of low concentration and small amount of dilute ammonia water. The ammonia water mixer for producing ammonia water from liquid ammonia has the remarkable characteristics of simple equipment, small overall investment, simple operation, low energy consumption, long equipment life, and strong adaptability.

[0031] The specific structure of the liquid ammonia to ammonia water mixer provided in the present application is described in detail below with reference to the accompanying drawings.

[0032] Reference Figure 1-Figure 3 As shown, the embodiment of the present application provides a liquid ammonia to ammonia water mixer, comprising a housing 10 and a Laval nozzle 20;

[0033] The shell 10 may be a stainless steel tube, with two ends of the tube respectively being a first open end and a second open end. An ammonia inlet is provided on the side of the shell 10, and the ammonia inlet may be a circular through hole.

[0034] The Laval nozzle 20 is arranged in the shell 10. The front half of the Laval nozzle 20 shrinks from large to small toward the middle to a narrow throat, and then expands from small to large and expands outward to the bottom of the arrow. The length of the Laval nozzle 20 is equal to or less than the length of the shell 10. The two ends of the Laval nozzle 20 are a softened water inlet 21 and a dilute ammonia solution outlet 22, respectively, and the outer diameters of the softened water inlet 21 and the dilute ammonia solution outlet 22 are matched with the inner diameter of the shell 10. The softened water inlet 21 and the dilute ammonia solution outlet 22 of the Laval nozzle 20 are respectively connected to the first open end and the second open end of the shell 10. The Laval nozzle 20 and the shell 10 can be welded as a whole.

[0035] Due to the leaky structure of the Laval nozzle 20, an annular cavity 30 is formed between the housing 10 and the Laval nozzle 20, and the ammonia inlet is connected to the annular cavity 30, and the position of the ammonia inlet corresponds to the narrow throat of the Laval nozzle 20;

[0036] A plurality of small injection holes 23 are provided on the side of the Laval nozzle 20 close to the outlet 22 of the dilute ammonia solution. The small injection holes 23 connect the annular cavity 30 with the interior of the Laval nozzle 20 .

[0037] The embodiment of the present application provides a liquid ammonia to ammonia water mixer, which is provided with an ammonia inlet on the side of a shell 10, and a Laval nozzle 20 is provided in the shell 10, the Laval nozzle 20 has a softened water inlet 21 and a dilute ammonia solution outlet 22, an annular cavity 30 is formed between the shell 10 and the Laval nozzle 20, and the ammonia inlet is connected to the annular cavity 30, and a plurality of injection holes 23 are provided on the side of the Laval nozzle 20 close to the dilute ammonia solution outlet, and the injection holes 23 connect the annular cavity 30 with the interior of the Laval nozzle 20, softened water enters the Laval nozzle 20 from the softened water inlet 21, liquid ammonia or ammonia gas enters the annular cavity 30 from the ammonia inlet, and then enters the Laval nozzle 20 through the plurality of injection holes 23, and is well mixed with the softened water to obtain low-concentration ammonia water.

[0038] Reference Figure 1 As shown, in some embodiments, a plurality of injection holes 23 are provided in a plurality of circles on the right side of the Laval nozzle 20, and the plurality of injection holes 23 in the same circle are evenly distributed around the central axis of the Laval nozzle 20;

[0039] The injection hole 23 is inclined, and the inner end of the injection hole 23 is inclined toward the dilute ammonia solution outlet 22, and the inclination angle can be 45 degrees, so as to facilitate high-concentration liquid ammonia or ammonia gas to enter the Laval nozzle 20 and mix well with softened water.

[0040] In some embodiments, a mixing mechanism is provided on the inner wall of the dilute ammonia solution outlet side of the Laval nozzle 20, and the mixing mechanism is used to fully mix the softened water with the high-concentration liquid ammonia or ammonia gas;

[0041] The mixing mechanism may be an X-shaped mixing blade 40 or other mixing blades, and the outer end of the X-shaped mixing blade 40 is detachably connected to the inner wall of the Laval nozzle 20 .

[0042] In some embodiments, a first filter assembly 50 is disposed on the inner wall of the softened water inlet side of the Laval nozzle 20 . The first filter assembly 50 may be a stainless steel filter mesh, which is detachably fixed to the inner wall of the left end of the Laval nozzle 20 .

[0043] Reference Figure 1-Figure 2 As shown, in some embodiments, the liquid ammonia to ammonia water mixer further includes a branch pipe body 60, which can be a stainless steel pipe body, and its pipe diameter matches the ammonia inlet;

[0044] The branch pipe body 60 is connected to the ammonia inlet. The branch pipe body 60 and the shell 10 can be welded together. The outer end of the branch pipe body 60 is a liquid ammonia / ammonia gas inlet 61. High-concentration liquid ammonia or ammonia gas enters the branch pipe body 60 through the liquid ammonia / ammonia gas inlet 61 and enters the annular cavity 30 through the ammonia inlet.

[0045] In some embodiments, a second filter assembly 70 is provided on the inner wall of the branch pipe body 60 at the liquid ammonia / ammonia gas inlet side;

[0046] The second filter assembly 70 is disposed on the inner wall of the top end of the branch pipe body 60;

[0047] The second filter assembly 70 includes a ring body and a filter screen. The filter screen is fixed in the ring body. The inner wall of the top end of the branch pipe body 60 is provided with an internal thread, and the outer wall of the ring body is provided with an external thread. The ring body is screwed into the branch pipe body 60. The filter screen can filter high-concentration liquid ammonia or ammonia gas to prevent debris from entering the annular cavity 30 and avoid clogging of the injection hole 23.

[0048] In some embodiments, a first flange 80 is disposed at the outer end of the branch pipe body 60 , and the branch pipe body 60 is connected to an external high-concentration liquid ammonia pipeline or an ammonia gas pipeline through the first flange 80 .

[0049] Reference Figure 1 As shown, in some embodiments, the first open end and the second open end of the shell 10 are both provided with a second flange 90, the first open end of the shell 10 is connected to the external softened water pipeline through the second flange 90, and the second open end of the shell 10 is connected to the storage device through the second flange 90.

[0050] According to the above technical features, the working principle of the liquid ammonia to ammonia water mixer provided by the present application in the actual application scenario is:

[0051] Before use, the top of the branch pipe body 60 is connected to an external high-concentration liquid ammonia pipeline or ammonia gas pipeline through the first flange 80, and the shell 10 is connected to an external softened water pipeline and a storage device through the second flanges 90 at both ends;

[0052] When using, Figure 3 As shown, Figure 3 The middle arrow a indicates the flow direction of softened water entering the Laval nozzle 20, the arrow b indicates the flow direction of high-concentration liquid ammonia or ammonia gas entering the branch pipe body 60, the arrow c indicates the flow direction of high-concentration liquid ammonia or ammonia gas in the annular cavity 30 entering the Laval nozzle 20, and the arrow d indicates the flow direction of low-concentration liquid ammonia;

[0053] The softened water inlet 21 is connected to a stable and continuous water source of softened water (0.4-0.6Mpa) pressurized by a water pump. The water flows into the mixer and is accelerated by the principle of the Laval nozzle. The concentrated liquid ammonia or ammonia gas enters the branch pipe body 60 from the liquid ammonia / ammonia gas inlet 61, and then enters the annular cavity 30 from the ammonia inlet. The annular cavity 30 mainly plays the role of gasification and buffering. Then, it enters the interior of the Laval nozzle 20 through a plurality of injection holes 23 distributed on the wall of the Laval nozzle, mixes with the softened water in the Laval nozzle 20 at the rear end, and flows at a high speed under the action of the X-shaped mixing blades 7 to achieve full mixing to obtain low-concentration liquid ammonia. The low-concentration liquid ammonia flows out from the dilute ammonia solution outlet 22 and enters the storage device.

[0054] The liquid ammonia to ammonia water mixer provided in the present application can achieve simple equipment, small overall investment, simple operation, low energy consumption, and long equipment life in the production of low-concentration ammonia water required by liquid ammonia. The flange connection designed for the equipment has the remarkable characteristics of easy on-site installation and strong adaptability. It solves the problem that the current liquid ammonia to ammonia water equipment has a complex structure, a large number of supporting equipment, a high construction cost, and is not suitable for use scenarios with low requirements for dilute ammonia concentration and small usage.

[0055] It is easy to understand that those skilled in the art can combine, split, reorganize, etc. the embodiments of the present application to obtain other embodiments based on the several embodiments provided in the present application, and these embodiments do not exceed the protection scope of the present application.

[0056] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A liquid ammonia to ammonia water mixer, characterized in that: It comprises a housing (10) and a Laval nozzle (20); The shell (10) has a first open end and a second open end opposite to each other, and an ammonia inlet is provided on a side of the shell (10); The Laval nozzle (20) is arranged in the shell (10), and the two ends of the Laval nozzle (20) are respectively a softened water inlet (21) and a dilute ammonia solution outlet (22), the softened water inlet (21) of the Laval nozzle (20) is connected to the first open end of the shell (10), and the dilute ammonia solution outlet (22) of the Laval nozzle (20) is connected to the second open end of the shell (10); An annular cavity (30) is formed between the shell (10) and the Laval nozzle (20), and the ammonia inlet is connected to the annular cavity (30); a plurality of injection holes (23) are provided on the side of the Laval nozzle (20) close to the dilute ammonia solution outlet (22), and the injection holes (23) connect the annular cavity (30) with the interior of the Laval nozzle (20).

2. The liquid ammonia to ammonia water mixer according to claim 1, characterized in that: The plurality of injection holes (23) are evenly distributed around the central axis of the Laval nozzle (20); The inner end of the injection hole (23) is inclined toward the dilute ammonia solution outlet (22).

3. The liquid ammonia to ammonia water mixer according to claim 1, characterized in that: The inner wall of the Laval nozzle (20) at the outlet side of the dilute ammonia solution is provided with a mixing mechanism; The mixing mechanism is an X-shaped mixing blade (40).

4. The liquid ammonia to ammonia water mixer according to claim 1, characterized in that: A first filter assembly (50) is provided on the inner wall of the softened water inlet side of the Laval nozzle (20).

5. The liquid ammonia to ammonia water mixer according to claim 1, characterized in that: The liquid ammonia to ammonia water mixer also includes a branch pipe body (60); The branch pipe body (60) is connected to the ammonia inlet, and the outer end of the branch pipe body (60) is a liquid ammonia / ammonia gas inlet (61).

6. The liquid ammonia to ammonia water mixer according to claim 5, characterized in that: A second filter assembly (70) is provided on the inner wall of the branch pipe body (60) at the liquid ammonia / ammonia gas inlet side.

7. The liquid ammonia to ammonia water mixer according to claim 5, characterized in that: The outer end of the branch pipe body (60) is provided with a first flange (80).

8. The liquid ammonia to ammonia water mixer according to claim 1, characterized in that: The first open end and the second open end of the housing (10) are both provided with a second flange (90).

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