Ammonia gas stable combustion device

Abstract

The utility model discloses an ammonia gas stable combustion device which comprises a flame generator, an ammonia gas adding device and a pure oxygen adding device, the flame generator enables ignition fuel and oxygen to be mixed and combusted to generate flames, the ammonia gas adding device is used for adding ammonia gas to the outer side of the flames, the pure oxygen adding device is used for adding pure oxygen to the outer side of the ammonia gas, and the ammonia gas is stably combusted in a high-temperature area of the flames under the oxygen-enriched condition. According to the device, ignition fuel and oxygen are mixed and combusted to generate flames, the temperature of a high-temperature area of the flames reaches 2000 DEG C, ammonia gas and pure oxygen are heated and ignited, and the ammonia gas is high in combustion speed and not prone to flameout under the oxygen-enriched working condition, so that the ammonia gas can be stably combusted in the high-temperature area of the flames under the oxygen-enriched condition.

Description

Technical Field

[0001] This utility model relates to the field of ammonia combustion technology, and in particular to an ammonia stable combustion device. Background Technology

[0002] Ammonia (NH3) has demonstrated significant application potential in the energy transition field in recent years. When burned in pure oxygen or air, its main products are environmentally friendly nitrogen (N2) and water vapor (H2O), fully meeting the environmental protection requirements of zero carbon emissions. In terms of storage and transportation characteristics, NH3 has significant advantages over hydrogen energy: its boiling point at atmospheric pressure reaches -33.4℃, and it only requires 0.86 MPa pressure to remain liquid at 20℃, reducing its liquefaction energy consumption by nearly 90% compared to liquid hydrogen, significantly improving the economics of large-scale storage and transportation. Regarding safety, the explosive concentration limit range of NH3 (15-28%) is significantly narrower than that of hydrogen (4-75%), and its auto-ignition temperature is as high as 651.1℃, fundamentally reducing the risk of deflagration during fuel storage and use.

[0003] However, the application of NH3 as a fuel still faces key technical bottlenecks: First, its high activation energy leads to deteriorated ignition characteristics, with a minimum ignition temperature of 651.1℃, about 300℃ higher than natural gas, making stable ignition difficult to achieve in conventional burners. Second, the combustion reaction kinetic rate is too low; the measured laminar flame propagation speed is only 1 / 5 that of methane (7 cm / s and 35 cm / s respectively when the equivalence ratio Φ=1), resulting in insufficient flame residence time and a high risk of flameout. These characteristics make it difficult to achieve a blending ratio of NH3 exceeding 20% ​​in existing coal-fired power generation systems, severely restricting its large-scale replacement of traditional fossil fuels. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide an ammonia stable combustion device to solve the technical problems of ammonia being difficult to ignite stably, burning slowly, and easily extinguishing.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A stable combustion device for ammonia includes a flame generator that generates a flame by mixing and burning an ignition fuel and oxygen, an ammonia adding device that adds ammonia to the outside of the flame, and a pure oxygen adding device that adds pure oxygen to the outside of the ammonia. The ammonia is stably combusted in the high-temperature region of the flame under oxygen-rich conditions.

[0007] Furthermore, the flame generator includes an ignition fuel delivery pipe and an oxygen delivery pipe, and the outlet ends of the ignition fuel delivery pipe and the oxygen delivery pipe are provided with nozzles, and the nozzles are provided with ignition devices.

[0008] Furthermore, the oxygen delivery pipe is coaxially sleeved outside the ignition fuel delivery pipe.

[0009] Furthermore, the ammonia addition device is an ammonia delivery pipe sleeved outside the ignition fuel delivery pipe and the oxygen delivery pipe, and the ammonia delivery pipe has discharge holes distributed at one end of the nozzle.

[0010] Furthermore, the pure oxygen addition device is a pure oxygen delivery pipe coaxially sleeved outside the ammonia delivery pipe, and the pure oxygen delivery pipe has a plurality of first gas holes distributed on one end face of the nozzle.

[0011] Furthermore, the pure oxygen delivery pipe has several second air holes distributed circumferentially on one end sidewall of the nozzle, and the second air holes are inclined when the pure oxygen delivery pipe is at one end of the nozzle as a reference.

[0012] Furthermore, several second vents are arranged in multiple spiral rows along the circumference of the pure oxygen delivery pipe.

[0013] Furthermore, the nozzle has multiple nozzle holes corresponding to the oxygen delivery pipe. These multiple nozzle holes are evenly spaced along the circumference of the oxygen delivery pipe and are simultaneously inclined in a clockwise or counterclockwise direction.

[0014] The beneficial effects of this utility model are:

[0015] The ammonia stable combustion device proposed in this utility model uses a mixture of ignition fuel and oxygen to generate a flame. The high temperature zone of the flame reaches 2000℃, which heats and ignites ammonia and pure oxygen. Ammonia burns quickly under oxygen-rich conditions and is not easy to extinguish. Therefore, ammonia can burn stably in the high temperature zone of the flame under oxygen-rich conditions.

[0016] Multiple nozzles corresponding to the oxygen delivery pipe at the nozzle are tilted simultaneously in a clockwise or counterclockwise direction, so that the ejected oxygen is in a swirling flow, realizing flame swirling. The swirling flame entrains ammonia gas, achieving full mixing of high-temperature flame and ammonia gas.

[0017] The ammonia gas is fully mixed with the high-temperature flame, and pure oxygen is used as the combustion-supporting gas, which ensures the combustion rate of the ammonia gas and avoids the corrosion and poisoning of the surrounding environment by the ammonia gas. Therefore, the device not only solves the problem of initial ignition of ammonia gas, but also solves the problem of slow combustion speed of ammonia gas, and minimizes the probability of ammonia gas escaping without ignition.

[0018] Pure oxygen and ammonia gas ejected from several first vents on the end face of the pure oxygen delivery pipe are heated and ignited in a high-temperature area. Pure oxygen ejected from several second vents on the side wall of the pure oxygen delivery pipe forms a gas film layer, which can prevent the high temperature generated by combustion from corroding the surrounding environment.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the following will describe this utility model in further detail with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is the front view of the present utility model.

[0022] Figure 2 This is a bottom view of the present invention.

[0023] Figure 3 for Figure 1 Enlarged schematic diagram of part A in the middle.

[0024] Figure 4 for Figure 1 Enlarged schematic diagram of section B in the middle.

[0025] In the diagram: 1. Ignition fuel delivery pipe; 2. Oxygen delivery pipe; 3. Nozzle; 4. Ammonia delivery pipe; 5. Discharge hole; 6. Pure oxygen delivery pipe; 7. First vent; 8. Second vent. Detailed Implementation

[0026] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1-4The ammonia stable combustion device 10 shown includes a flame generator that generates a flame by mixing and burning ignition fuel and oxygen, an ammonia adding device that adds ammonia to the outside of the flame, and a pure oxygen adding device that adds pure oxygen to the outside of the ammonia. The specific flame generator includes an ignition fuel delivery pipe 1 and an oxygen delivery pipe 2. The oxygen delivery pipe 2 is coaxially sleeved outside the ignition fuel delivery pipe 1. The outlet ends of the ignition fuel delivery pipe 1 and the oxygen delivery pipe 2 are provided with nozzles 3. The nozzles 3 have multiple nozzle holes corresponding to the oxygen delivery pipe 2. The multiple nozzle holes are evenly spaced along the circumference of the oxygen delivery pipe 2 and are simultaneously inclined in a clockwise or counterclockwise direction. The nozzles 3 are provided with an ignition device. The ammonia gas addition device includes an ammonia gas delivery pipe 4, which is coaxially sleeved outside the oxygen delivery pipe 2. The ammonia gas delivery pipe 4 has several outlet holes 5 distributed around the circumference of one end face of the nozzle 3. The pure oxygen addition device includes a pure oxygen delivery pipe 6, which is coaxially sleeved outside the ammonia gas delivery pipe 4. The pure oxygen delivery pipe 6 has several first gas holes 7 distributed around the circumference of one end face of the nozzle 3.

[0029] Example 2

[0030] The difference from Embodiment 1 is that: the pure oxygen delivery pipe 6 has a number of second air holes 8 distributed circumferentially on one end side wall of the nozzle 3. When the pure oxygen delivery pipe 6 is at one end of the nozzle 3 as a reference, the second air holes 8 are inclined and arranged in multiple spiral rows along the circumference of the pure oxygen delivery pipe 6.

[0031] The device uses an ignition fuel supply pipe 1 and an oxygen supply pipe 2 to deliver ignition fuel and oxygen to a nozzle 3, where they mix and are ignited by an ignition device to generate a flame. Ammonia is delivered by an ammonia supply pipe 4 to the high-temperature region outside the flame, where it is heated. Similarly, pure oxygen is delivered by a pure oxygen supply pipe 6 to the region outside the ammonia, where it is also heated. Because the high-temperature region of the flame reaches 2000℃, the ammonia and pure oxygen are ignited. The ammonia burns rapidly and stably under high temperature and oxygen-rich conditions, making it difficult to extinguish. Multiple nozzles at nozzle 3, corresponding to the oxygen supply pipe, are simultaneously tilted clockwise or counterclockwise, causing the ejected oxygen to swirl, creating a swirling flame. This swirling flame entrains ammonia, ensuring thorough mixing between the high-temperature flame and the ammonia. This thorough mixing of ammonia with the high-temperature flame, and the use of pure oxygen as an oxidizing gas, ensures a high burnout rate for the ammonia and prevents corrosion and toxicity to the surrounding environment. Therefore, this device solves both the initial ignition problem and the slow combustion rate of ammonia, while also minimizing the probability of ammonia escaping due to lack of ignition.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An ammonia gas stabilization combustion device, characterized in that: It includes a flame generator that uses a mixture of ignition fuel and oxygen to produce a flame, an ammonia addition device that adds ammonia to the outside of the flame, and a pure oxygen addition device that adds pure oxygen to the outside of the ammonia. The ammonia burns stably in the high-temperature region of the flame under oxygen-rich conditions.

2. The ammonia stable combustion device according to claim 1, characterized in that: The flame generator includes an ignition fuel delivery pipe (1) and an oxygen delivery pipe (2). The outlet ends of the ignition fuel delivery pipe (1) and the oxygen delivery pipe (2) are provided with nozzles (3), and the nozzles (3) are provided with ignition devices.

3. The ammonia stable combustion device according to claim 2, characterized in that: The oxygen delivery pipe (2) is coaxially sleeved outside the ignition fuel delivery pipe (1).

4. The ammonia stable combustion device according to claim 2, characterized in that: The ammonia addition device is an ammonia delivery pipe (4) installed outside the ignition fuel delivery pipe (1) and the oxygen delivery pipe (2). The ammonia delivery pipe (4) has discharge holes (5) distributed at one end of the nozzle (3).

5. The ammonia stable combustion device according to claim 4, characterized in that: The pure oxygen addition device is a pure oxygen delivery pipe (6) coaxially sleeved outside the ammonia delivery pipe (4), and the pure oxygen delivery pipe (6) has a number of first air holes (7) distributed on one end face of the nozzle (3).

6. The ammonia stable combustion device according to claim 5, characterized in that: The pure oxygen delivery pipe (6) has several second air holes (8) distributed circumferentially on one end side wall of the nozzle (3). When the pure oxygen delivery pipe (6) is at one end of the nozzle (3) as a reference, the second air holes (8) are inclined.

7. The ammonia stable combustion device according to claim 6, characterized in that: Several second air holes (8) are arranged in multiple spirals along the circumference of the pure oxygen delivery pipe (6).

8. The ammonia stable combustion device according to claim 2, characterized in that: The nozzle has multiple nozzle holes corresponding to the oxygen delivery pipe. These nozzle holes are evenly spaced along the circumference of the oxygen delivery pipe and are simultaneously inclined in a clockwise or counterclockwise direction.

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