Ammonia water vaporizer

Abstract

The utility model provides an ammonia water vaporizer, which belongs to the technical field of flue gas denitration, and comprises a gas-liquid mixing evaporator, the gas-liquid mixing evaporator comprises a straight pipe section, the top of the straight pipe section is provided with a top inlet, the top inlet is connected with an ammonia water inlet device, the middle of the straight pipe section is provided with a middle inlet, and the middle inlet is connected with a steam inlet device. The bottom of the straight pipe section is provided with a necking section, the bottom of the necking section is provided with a throat part, the bottom of the throat part is provided with a flaring section, the bottom of the flaring section is provided with a bottom outlet, and the bottom outlet is connected with an air outlet device; according to the vaporizer, ammonia water can be fully atomized by utilizing the shearing effect of high-temperature and high-pressure steam on fluid in the flowing process, efficient, rapid and full heat exchange of the steam and the ammonia water is realized while atomization is performed, and the quality of mixed gas at an outlet can be improved while the gas pressure at the outlet of the vaporizer is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitrification, in particular to an ammonia water vaporizer. Background Art

[0002] In some existing production processes, ammonia water needs to be converted into gaseous form for use. Currently, ammonia water vaporization adopts two heat exchange methods: direct heating and indirect heating. The energy consumed by evaporation mostly comes from hot flue gas, hot steam and electricity.

[0003] The currently commonly used ammonia evaporation system still has a series of problems: (1) Hot steam indirectly heats ammonia through a shell and tube heat exchanger, converting ammonia into a mixture of ammonia and water vapor, and the hot steam is converted into hydrophobicity and discharged or recycled. This method has low heat exchange efficiency, slow heat exchange, poor adjustability, poor steam energy utilization, low outlet ammonia pressure and poor adjustment performance; (2) Hot flue gas or electric heating air is used to heat the air, and the heated hot air is passed into the evaporation tank, and the sprayed ammonia droplets are vaporized in the evaporation tank. This is direct heat exchange, and the gas coming out is a mixture of air, water vapor and ammonia. This method has low heat utilization efficiency, low gas outlet pressure, easy corrosion of equipment, and poor system reliability.

[0004] In view of the above problems, there is an urgent need for a high-efficiency ammonia vaporizer that is suitable for the flue gas working conditions of coal-fired boilers. Utility Model Content

[0005] The purpose of the present invention is to provide an ammonia vaporizer to overcome the problems existing in the prior art. The present invention can fully atomize the ammonia by utilizing the shearing effect of high-temperature and high-pressure steam on the fluid during the flow process. Not only can efficient, rapid and sufficient heat exchange between steam and ammonia be achieved during atomization, but the quality of the outlet mixed gas can also be increased while ensuring the gas pressure at the vaporizer outlet.

[0006] In order to achieve the above-mentioned purpose, the technical solutions adopted by the present invention are as follows:

[0007] An ammonia vaporizer includes a gas-liquid mixing evaporator, the gas-liquid mixing evaporator including a straight pipe section, a top inlet installed at the top of the straight pipe section, the top inlet connected to an ammonia liquid inlet device, a middle inlet installed at the middle of the straight pipe section, the middle inlet connected to a steam inlet device, a necking section installed at the bottom of the straight pipe section, a throat installed at the bottom of the necking section, an expanding section installed at the bottom of the throat, a bottom outlet installed at the bottom of the expanding section, and a gas outlet connected to the gas outlet device;

[0008] Furthermore, the ammonia liquid inlet device includes an ammonia pipeline, and the ammonia pipeline is connected to an ammonia flow meter, an ammonia flow regulating valve and an ammonia manual valve in sequence from upstream to downstream;

[0009] Furthermore, the steam intake device includes a steam intake pipe, and the ammonia water pipe is sequentially connected to a steam manual valve, a steam pressure reducing and stabilizing valve, a steam flow meter and a steam flow regulating valve from upstream to downstream;

[0010] Furthermore, the angle between the steam inlet pipe and the straight pipe section is 90°;

[0011] Furthermore, the steam pressure reducing and stabilizing valve controls the steam pressure to 0.05-0.8 MPa;

[0012] Furthermore, the steam flow regulating valve controls the mass ratio of steam flow and ammonia water flow to be (2-20):1;

[0013] Furthermore, the gas outlet device includes a gas outlet pipe, and the gas outlet pipe is connected to a spray gun valve and a drain valve in sequence from upstream to downstream;

[0014] Furthermore, the length of the straight pipe section is 100-1000 mm; the length of the expanded section is 200-2000 mm;

[0015] Furthermore, the angle between the connection between the necking section (8-2) and the throat section (8-3) is 5° to 20°;

[0016] Furthermore, the angle between the flared section (8-4) and the throat (8-3) is 5° to 30°.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] The utility model provides an ammonia water vaporizer. The gas-liquid mixing evaporator comprises a straight pipe section, a necking section, a throat section, and a flared section from upstream to downstream. The length of the straight pipe section, the angle between the necking section and the throat, the angle between the flared section and the throat, and the length of the flared section are determined according to actual conditions on site. Ammonia water and steam are preliminarily mixed through the top inlet and the middle inlet, while the ammonia water evaporation reaction is carried out in the straight pipe section. The ammonia gas and steam are fully mixed in the flared section. The ammonia water is fully atomized by the shearing effect brought by the high flow rate of the steam. At the same time, accompanied by intense heat exchange, the ammonia water is quickly vaporized, thereby accelerating the vaporization rate of the ammonia water and improving the efficiency of the entire device.

[0019] Furthermore, the ammonia flow meter can measure and display the ammonia flow in real time, ensuring the accuracy and traceability of the flow; the ammonia flow regulating valve can adjust the ammonia flow according to on-site needs to stabilize the pressure within the required range; the ammonia manual valve can manually close the ammonia pipeline when the system is shut down to block the inflow of ammonia and prevent potential safety risks.

[0020] Furthermore, through the manual valve, when the system is shut down, the steam inlet pipe can be manually closed to block the steam inflow and ensure the safety of operation; the steam pressure reducing and stabilizing valve can be used to reduce the pressure of the incoming steam and stabilize it; the steam flow meter can measure the steam flow in real time, which helps to detect flow anomalies in time and ensure the stability of the process; the steam flow regulating valve controls the ratio of the steam flow and the ammonia flow entering the ammonia vaporizer to the required range, ensuring the efficient implementation of the vaporization process.

[0021] Furthermore, the steam inlet pipe is arranged at 90 degrees to the straight pipe section, which helps to form a better mixing effect between the steam and the ammonia water when entering the straight pipe section, and can cause the steam flow to generate turbulence when hitting the inner wall of the straight pipe section, thereby increasing the contact area between the steam and the ammonia water and promoting the vaporization process; by precisely controlling the flow ratio of steam and ammonia water, the accuracy and stability of the vaporization process can be ensured, and the vaporization quality can be improved.

[0022] Furthermore, the mixed gas can be led to the next link through the outlet pipe, and the setting of the steam trap can effectively prevent the accumulation and blockage of condensed water in the outlet pipe. During the vaporization process of ammonia water, due to temperature changes, water vapor may condense into water. If it is not discharged in time, it may cause pipe blockage and affect the normal operation of the system. The introduction of the steam trap can automatically discharge these condensed water to ensure that the outlet pipe is unobstructed.

[0023] Furthermore, by setting the length range of the straight pipe section and the expanded section, it is helpful to have enough time and space for steam and ammonia water to fully mix and react in the pipeline according to different situations, thereby improving the vaporization efficiency and the flexibility of the device.

[0024] Furthermore, by setting the angle range of the connection between the necking section and the throat, it is helpful to fully mix and react the steam and ammonia water, and it can also reduce the impact and friction of the fluid on the pipe wall and reduce energy loss.

[0025] Furthermore, by setting the angle range of the connection between the flared section and the throat, it is possible to ensure a smooth flow transition of the fluid when it transitions from the throat to the flared section, reducing the impact of the fluid on the pipe wall and the formation of vortices, which helps to reduce energy loss and improve the efficiency and stability of fluid flow; at the same time, it can also enable the steam to diffuse better when flowing through the flared section, and to have more complete contact and mixing with the ammonia water, thereby improving the vaporization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of an ammonia vaporizer of the utility model;

[0027] Figure 2 This is a partial structural diagram of a gas-liquid mixing evaporator in an ammonia water vaporizer of the utility model;

[0028] In the figure, 1-steam manual valve; 2-steam pressure reducing and stabilizing valve; 3-steam flow meter; 4-steam flow regulating valve; 5-ammonia flow meter; 6-ammonia flow regulating valve; 7-ammonia manual valve; 8-gas-liquid mixing evaporator; 8-1-straight pipe section; 8-2-constricted section; 8-3-throat; 8-4-expanding section; 8-5-top inlet; 8-6-middle inlet; 8-7-bottom outlet; 9-steam inlet pipe; 10-ammonia pipe; 11-trap; 12-exhaust pipe; 13-spray gun valve. DETAILED DESCRIPTION

[0029] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component. When a component is considered to be "disposed on" another component, it may be directly disposed on the other component or there may be a centrally located component.

[0031] In addition, the terms "long", "short", "inside", "outside", etc. that indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention. They do not indicate or imply that the device or component referred to must have this specific orientation or operate in a specific orientation structure, and should not be understood as a limitation of the present invention.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1:

[0034] like Figure 1 and Figure 2As shown, the utility model provides an ammonia vaporizer, including a gas-liquid mixing evaporator 8, the gas-liquid mixing evaporator 8 includes a straight pipe section 8-1, the straight pipe section 8-1 performs an ammonia evaporation reaction, a top inlet 8-5 is installed on the top of the straight pipe section 8-1, the top inlet 8-5 is connected to an ammonia liquid inlet device, the ammonia liquid inlet device includes an ammonia pipeline 10, the ammonia pipeline 10 is sequentially connected to an ammonia flow meter 5, an ammonia flow regulating valve 6 and an ammonia manual valve 7 from upstream to downstream, the ammonia flow meter 5 can be used to measure and display the ammonia flow in real time; the ammonia flow regulating valve 6 can be used to adjust the ammonia flow according to on-site needs; the ammonia manual valve 7 can be used to manually close the ammonia pipeline 10 when the system is shut down to block the flow of ammonia; a middle inlet 8-6 is installed in the middle of the straight pipe section 8-1, the middle inlet 8-6 is connected to a steam intake device, the steam intake device includes a steam intake pipeline 9, the ammonia pipeline 10 is connected from upstream to downstream To the downstream, there are sequentially connected a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3 and a steam flow regulating valve 4. Through the manual valve 1, when the system is shut down, the steam inlet pipe 9 can be manually closed to block the inflow of steam; the steam pressure reducing and stabilizing valve 2 is used to reduce the pressure and stabilize the incoming steam; the steam flow can be measured in real time by the steam flow meter 3; a constricted section 8-2 is installed at the bottom of the straight pipe section 8-1, a throat 8-3 is installed at the bottom of the constricted section 8-2, and an expanding section 8-4 is installed at the bottom of the throat 8-3. The expanding section 8-4 is used to mix ammonia and steam, and a bottom outlet 8-7 is installed at the bottom of the expanding section 8-4. The bottom outlet 8-7 is connected to an exhaust device, which includes an exhaust pipe 12 to lead the mixed gas to the next link. The exhaust pipe 12 is sequentially connected to a spray gun valve 13 and a steam trap 11 from upstream to downstream. The steam trap 11 is opened regularly to discharge the liquid retained in the vaporizer;

[0035] Preferably, the angle between the steam inlet pipe 9 and the straight pipe section 8-1 is 90°;

[0036] Preferably, the steam pressure reducing and stabilizing valve 2 controls the pressure of the incoming steam to 0.05-0.8 MPa;

[0037] Preferably, the steam flow regulating valve 4 controls the mass ratio of the steam flow and the ammonia flow entering the ammonia vaporizer to be (2-20):1;

[0038] Preferably, the length of the straight pipe section 8-1 is 100-1000 mm; the length of the necking section 8-2 is 100 mm; the length of the throat section 8-3 is 200 mm; the length of the flaring section 8-4 is 200-2000 mm;

[0039] Preferably, the angle between the necking section 8-2 and the throat section 8-3 is 5° to 20°;

[0040] Preferably, the angle between the flared section 8-4 and the throat 8-3 is 5° to 30°.

[0041] Example 2:

[0042] The utility model provides an ammonia water vaporizer, comprising a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3, a steam flow regulating valve 4, an ammonia water flow meter 5, an ammonia water flow regulating valve 6, an ammonia water manual valve 7, a gas-liquid mixing evaporator 8, a steam inlet pipe 9, an ammonia water pipe 10, a steam trap 11, an air outlet pipe and a spray gun valve 13.

[0043] like Figure 2 As shown, the gas-liquid mixing evaporator 8 includes a straight pipe section 8-1, a constricted section 8-2, a throat section 8-3, a flared section 8-4, a top inlet 8-5, a middle inlet 8-6 and a bottom outlet 8-7;

[0044] A top inlet 8-5 is installed at the top of the straight pipe section 8-1, and the top inlet 8-5 is connected to the ammonia liquid inlet device. A middle inlet 8-6 is installed in the middle of the straight pipe section 8-1, and the middle inlet 8-6 is connected to the steam inlet device. A constricted section 8-2 is installed at the bottom of the straight pipe section 8-1, a throat 8-3 is installed at the bottom of the constricted section 8-2, a flared section 8-4 is installed at the bottom of the throat 8-3, a bottom outlet 8-7 is installed at the bottom of the flared section 8-4, and the bottom outlet 8-7 is connected to the gas outlet device.

[0045] Preferably, the length of the straight pipe section 8-1 is 100 mm; the length of the necking section 8-2 is 100 mm, the length of the throat section 8-3 is 200 mm; the length of the flaring section 8-4 is 200 mm;

[0046] Preferably, the angle between the necking section 8-2 and the throat section 8-3 is 5°;

[0047] Preferably, the angle between the flared section 8-4 and the throat portion 8-3 is 5°.

[0048] like Figure 1 As shown, the ammonia liquid inlet device includes an ammonia liquid pipeline 10, which is connected to an ammonia liquid flow meter 5, an ammonia liquid flow regulating valve 6 and an ammonia liquid manual valve 7 in sequence from upstream to downstream; the steam air intake device includes a steam air intake pipeline 9, and the angle between the steam air intake pipeline 9 and the straight pipe section 8-1 is 90°. The ammonia liquid pipeline 10 is connected to a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3 and a steam flow regulating valve 4 in sequence from upstream to downstream. The steam pressure reducing and stabilizing valve 2 controls the steam pressure to 0.05 MPa, and the steam flow regulating valve 4 controls the mass ratio of steam flow and ammonia liquid flow to 2:1; the air outlet device includes an air outlet pipeline 12, which is connected to a spray gun valve 13 and a steam trap 11 in sequence from upstream to downstream.

[0049] Example 3:

[0050] The utility model provides an ammonia water vaporizer, comprising a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3, a steam flow regulating valve 4, an ammonia water flow meter 5, an ammonia water flow regulating valve 6, an ammonia water manual valve 7, a gas-liquid mixing evaporator 8, a steam inlet pipe 9, an ammonia water pipe 10, a steam trap 11, an air outlet pipe and a spray gun valve 13.

[0051] like Figure 2 As shown, the gas-liquid mixing evaporator 8 includes a straight pipe section 8-1, a constricted section 8-2, a throat section 8-3, a flared section 8-4, a top inlet 8-5, a middle inlet 8-6 and a bottom outlet 8-7;

[0052] A top inlet 8-5 is installed at the top of the straight pipe section 8-1, and the top inlet 8-5 is connected to the ammonia liquid inlet device. A middle inlet 8-6 is installed in the middle of the straight pipe section 8-1, and the middle inlet 8-6 is connected to the steam inlet device. A constricted section 8-2 is installed at the bottom of the straight pipe section 8-1, a throat 8-3 is installed at the bottom of the constricted section 8-2, a flared section 8-4 is installed at the bottom of the throat 8-3, a bottom outlet 8-7 is installed at the bottom of the flared section 8-4, and the bottom outlet 8-7 is connected to the gas outlet device.

[0053] Preferably, the length of the straight pipe section 8-1 is 300 mm; the length of the necking section 8-2 is 100 mm; the length of the throat section 8-3 is 200 mm; and the length of the flaring section 8-4 is 300 mm.

[0054] Preferably, the angle between the necking section 8-2 and the throat section 8-3 is 20°;

[0055] Preferably, the angle between the flared section 8-4 and the throat portion 8-3 is 8°.

[0056] like Figure 1 As shown, the ammonia liquid inlet device includes an ammonia liquid pipeline 10, which is connected to an ammonia liquid flow meter 5, an ammonia liquid flow regulating valve 6 and an ammonia liquid manual valve 7 in sequence from upstream to downstream; the steam air intake device includes a steam air intake pipeline 9, and the angle between the steam air intake pipeline 9 and the straight pipe section 8-1 is 90°. The ammonia liquid pipeline 10 is connected to a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3 and a steam flow regulating valve 4 in sequence from upstream to downstream. The steam pressure reducing and stabilizing valve 2 controls the steam pressure to 0.1 MPa, and the steam flow regulating valve 4 controls the mass ratio of the steam flow and the ammonia liquid flow to 10:1; the air outlet device includes an air outlet pipeline 12, which is connected to a spray gun valve 13 and a steam trap 11 in sequence from upstream to downstream.

[0057] Example 4:

[0058] The utility model provides an ammonia water vaporizer, comprising a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3, a steam flow regulating valve 4, an ammonia water flow meter 5, an ammonia water flow regulating valve 6, an ammonia water manual valve 7, a gas-liquid mixing evaporator 8, a steam inlet pipe 9, an ammonia water pipe 10, a steam trap 11, an air outlet pipe and a spray gun valve 13.

[0059] like Figure 2 As shown, the gas-liquid mixing evaporator 8 includes a straight pipe section 8-1, a constricted section 8-2, a throat section 8-3, a flared section 8-4, a top inlet 8-5, a middle inlet 8-6 and a bottom outlet 8-7;

[0060] A top inlet 8-5 is installed at the top of the straight pipe section 8-1, and the top inlet 8-5 is connected to the ammonia liquid inlet device. A middle inlet 8-6 is installed in the middle of the straight pipe section 8-1, and the middle inlet 8-6 is connected to the steam inlet device. A constricted section 8-2 is installed at the bottom of the straight pipe section 8-1, a throat 8-3 is installed at the bottom of the constricted section 8-2, a flared section 8-4 is installed at the bottom of the throat 8-3, a bottom outlet 8-7 is installed at the bottom of the flared section 8-4, and the bottom outlet 8-7 is connected to the gas outlet device.

[0061] Preferably, the length of the straight pipe section 8-1 is 1000 mm; the length of the necking section 8-2 is 100 mm; the length of the throat section 8-3 is 200 mm; and the length of the flaring section 8-4 is 2000 mm.

[0062] Preferably, the angle between the necking section 8-2 and the throat section 8-3 is 20°;

[0063] Preferably, the angle between the flared section 8-4 and the throat portion 8-3 is 30°.

[0064] like Figure 1 As shown, the ammonia liquid inlet device includes an ammonia liquid pipeline 10, which is connected to an ammonia liquid flow meter 5, an ammonia liquid flow regulating valve 6 and an ammonia liquid manual valve 7 in sequence from upstream to downstream; the steam air intake device includes a steam air intake pipeline 9, and the angle between the steam air intake pipeline 9 and the straight pipe section 8-1 is 90°. The ammonia liquid pipeline 10 is connected to a steam manual valve 1, a steam pressure reducing and stabilizing valve 2, a steam flow meter 3 and a steam flow regulating valve 4 in sequence from upstream to downstream. The steam pressure reducing and stabilizing valve 2 controls the steam pressure to 0.8 MPa, and the steam flow regulating valve 4 controls the mass ratio of steam flow to ammonia liquid flow to 20:1; the air outlet device includes an air outlet pipeline 12, which is connected to a spray gun valve 13 and a steam trap 11 in sequence from upstream to downstream.

[0065] The structure and working principle of the utility model are further described below:

[0066] The purpose of the present utility model is to provide an ammonia vaporizer. Before starting the equipment, it is necessary to first open the steam flow regulating valve 4 and the drain valve 11. When no liquid is discharged from the vaporizer, the drain valve 11 is closed, the ammonia flow regulating valve 6 is opened, and ammonia is introduced into the gas-liquid mixing evaporator 8. In the straight pipe section 8-1 of the gas-liquid mixing evaporator 8, the ammonia is fully atomized by the shearing effect brought by the high flow rate of steam. At the same time, accompanied by intense heat exchange, the ammonia is quickly vaporized.

[0067] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ammonia vaporizer, characterized in that: The invention comprises a gas-liquid mixing evaporator (8), which comprises a straight pipe section (8-1), a top inlet (8-5) is installed at the top of the straight pipe section (8-1), the top inlet (8-5) is connected to an ammonia liquid inlet device, a middle inlet (8-6) is installed at the middle of the straight pipe section (8-1), the middle inlet (8-6) is connected to a steam inlet device, a constricted section (8-2) is installed at the bottom of the straight pipe section (8-1), a throat (8-3) is installed at the bottom of the constricted section (8-2), an expanding section (8-4) is installed at the bottom of the throat (8-3), a bottom outlet (8-7) is installed at the bottom of the expanding section (8-4), and the bottom outlet (8-7) is connected to an air outlet device.

2. The ammonia vaporizer according to claim 1, characterized in that: The ammonia water inlet device comprises an ammonia water pipeline (10), and the ammonia water pipeline (10) is connected to an ammonia water flow meter (5), an ammonia water flow regulating valve (6), and an ammonia water manual valve (7) in sequence from upstream to downstream.

3. The ammonia vaporizer according to claim 1, characterized in that: The steam intake device comprises a steam intake pipe (9), and the ammonia water pipe (10) is connected to a steam manual valve (1), a steam pressure reducing and stabilizing valve (2), a steam flow meter (3), and a steam flow regulating valve (4) in sequence from upstream to downstream.

4. The ammonia vaporizer according to claim 3, characterized in that: The angle between the steam inlet pipe (9) and the straight pipe section (8-1) is 90°.

5. The ammonia vaporizer according to claim 3, characterized in that: The steam pressure reducing and stabilizing valve (2) controls the steam pressure to 0.05-0.8 MPa.

6. The ammonia vaporizer according to claim 3, characterized in that: The steam flow regulating valve (4) controls the mass ratio of steam flow to ammonia water flow to be (2-20):

1.

7. The ammonia vaporizer according to claim 1, characterized in that: The gas outlet device comprises a gas outlet pipe (12), and the gas outlet pipe (12) is connected to a spray gun valve (13) and a drain valve (11) in sequence from upstream to downstream.

8. The ammonia vaporizer according to claim 1, characterized in that: The length of the straight pipe section (8-1) is 100-1000 mm; the length of the expanded section (8-4) is 200-2000 mm.

9. The ammonia vaporizer according to claim 1, characterized in that: The angle between the necking section (8-2) and the throat (8-3) is 5° to 20°.

10. The ammonia vaporizer according to claim 1, characterized in that: The included angle at the connection between the flared section (8-4) and the throat (8-3) is 5° to 30°.

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