A heat energy recycling system based on catalytic decomposition of ammonia gas

Abstract

This utility model discloses a heat energy recycling system based on the catalytic decomposition of ammonia, belonging to the field of industrial waste gas treatment technology. It includes an ammonia treatment unit, a first heat exchanger, and a second heat exchanger. The ammonia treatment unit includes an ammonia catalytic combustion reactor for decomposing ammonia and a vent pipe for introducing ammonia gas discharged from a nitriding furnace into the ammonia catalytic combustion reactor. The vent pipe is equipped with the first heat exchanger, and the ammonia catalytic combustion reactor is equipped with an exhaust pipe for connecting to the second heat exchanger. The exhaust pipe is equipped with a bypass branch pipe that can connect to the first heat exchanger. This utility model's heat energy recycling system based on the catalytic decomposition of ammonia solves the problem of energy waste in existing ammonia catalytic treatment methods.

Description

Technical Field

[0001] This utility model belongs to the field of industrial waste gas treatment technology, specifically relating to a heat energy recycling system based on the catalytic decomposition of ammonia. Background Technology

[0002] In the metal heat treatment industry, nitriding furnaces are commonly used equipment, and they emit waste gas containing ammonia during operation. Currently, this type of ammonia waste gas is mostly treated by combustion, that is, converting ammonia through high-temperature combustion. However, this treatment method has obvious drawbacks: on the one hand, the high-temperature gases generated during combustion (usually containing nitrogen, water vapor, etc.) carry a large amount of heat energy, which is often directly emitted without effective recovery, resulting in serious energy waste; on the other hand, the ammonia gas discharged from the nitriding furnace usually needs to be preheated before entering the furnace, and traditional preheating methods mostly rely on electric heating or other external heat sources, increasing additional energy consumption. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a heat energy recycling system based on the catalytic decomposition of ammonia, which solves the problem of energy waste in the existing ammonia catalytic treatment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a heat energy recycling system based on the catalytic decomposition of ammonia, comprising an ammonia processing unit, a first heat exchanger, and a second heat exchanger; The ammonia treatment unit includes an ammonia catalytic combustion reactor for decomposing ammonia and a vent pipe for introducing ammonia discharged from the nitriding furnace into the ammonia catalytic combustion reactor. A first heat exchanger is provided on the vent pipe, and an exhaust pipe for connecting to a second heat exchanger is provided on the ammonia catalytic combustion reactor. A bypass branch pipe for connecting to the first heat exchanger is provided on the exhaust pipe.

[0005] Optionally, the vent pipe includes a first section that is sealed at one end to the exhaust port of the nitriding furnace and a second section that is sealed at one end to the inlet of the ammonia catalytic combustion reactor. The other end of the first section is sealed to the cold side inlet of the first heat exchanger, and the other end of the second section is sealed to the cold side outlet of the first heat exchanger. The first section and the second section on the vent pipe can form a passage with the first heat exchanger.

[0006] Optionally, a first flow control valve is provided on the first section of the vent pipe.

[0007] Optionally, a temperature sensor for monitoring the temperature of the internal circulating medium is provided on the second section of the vent pipe.

[0008] Optionally, one end of the bypass branch pipe can be sealed to the hot-side inlet of the first heat exchanger.

[0009] Optionally, a second flow control valve is provided on the bypass branch.

[0010] Optionally, one end of the exhaust pipe is sealed to the hot side inlet of the second heat exchanger, and the hot side outlet of the first heat exchanger is sealed to a first waste pipe that can form a passage with the exhaust pipe.

[0011] Optionally, the hot-side outlet of the first heat exchanger can be connected to the first waste pipe via the second waste pipe.

[0012] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: Ammonia gas discharged from the nitriding furnace can enter the ammonia catalytic combustion reactor through a vent pipe. Under the action of the ammonia catalytic combustion reactor, the ammonia gas can be decomposed into nitrogen and water, which are environmentally friendly. The nitrogen gas can be discharged from the exhaust pipe along with the higher-temperature air. During this process, a portion of the high-temperature gas discharged from the exhaust pipe can be introduced into the first heat exchanger installed on the vent pipe through a bypass branch pipe, thus serving as a heat source for preheating the ammonia gas. Another portion of the high-temperature gas discharged from the exhaust pipe can also serve as a heat source for the second heat exchanger, allowing the second heat exchanger to apply the heat from the heat source to other equipment. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the thermal energy recycling system based on ammonia catalytic decomposition in a preferred embodiment of the present invention. Among them, 1. First heat exchanger; 2. Second heat exchanger; 3. Ammonia catalytic combustion reactor; 4. Vent pipe; 5. Exhaust pipe; 6. Bypass branch pipe; 7. First flow control valve; 8. Temperature sensor; 9. Second flow control valve; 10. First waste discharge pipe; 11. Second waste discharge pipe; 12. Nitriding furnace. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0016] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0017] like Figure 1 As shown, a heat energy recycling system based on ammonia catalytic decomposition includes an ammonia treatment unit, a first heat exchanger 1, and a second heat exchanger 2. The ammonia treatment unit includes an ammonia catalytic combustion reactor 3 for decomposing ammonia and a vent pipe 4 for introducing ammonia discharged from the nitriding furnace 12 into the ammonia catalytic combustion reactor 3. The vent pipe 4 is equipped with the first heat exchanger 1, and the ammonia catalytic combustion reactor 3 is equipped with an exhaust pipe 5 for connecting to the second heat exchanger 2. The exhaust pipe 5 is equipped with a bypass branch pipe 6 that can connect to the first heat exchanger 1.

[0018] In actual use, the ammonia gas discharged from the nitriding furnace 12 can enter the ammonia catalytic combustion reactor 3 through the vent pipe 4. Under the action of the ammonia catalytic combustion reactor 3, the ammonia gas can be decomposed into nitrogen gas and water, which are pollution-free to the environment. The nitrogen gas can be discharged from the exhaust pipe 5 along with the high-temperature air. During this process, part of the high-temperature gas discharged from the exhaust pipe 5 can be introduced into the first heat exchanger 1 installed on the vent pipe 4 through the bypass branch pipe 6, thus serving as a heat source for preheating the ammonia gas. The other part of the high-temperature gas discharged from the exhaust pipe 5 can also serve as a heat source for the second heat exchanger 2, allowing the second heat exchanger 2 to apply the heat from the heat source to other equipment.

[0019] Specifically, such as Figure 1 As shown, the vent pipe 4 includes a first section that is sealed at one end to the exhaust port of the nitriding furnace 12 and a second section that is sealed at one end to the inlet of the ammonia catalytic combustion reactor 3; wherein, the other end of the first section is sealed to the cold side inlet of the first heat exchanger 1, and the other end of the second section is sealed to the cold side outlet of the first heat exchanger 1, and the first section and the second section on the vent pipe 4 can form a passage with the first heat exchanger 1.

[0020] It is important to note that, such as Figure 1 As shown, a first flow control valve 7 is installed on the first section of the vent pipe 4 to control the flow rate of ammonia gas entering the first heat exchanger 1. Meanwhile, a temperature sensor 8 is installed on the second section of the vent pipe 4 to monitor the temperature of the internal circulating medium. The temperature sensor 8 is electrically connected to the first flow control valve 7 via electronic components such as a controller to ensure that the ammonia gas entering the ammonia catalytic combustion reactor 3 meets the preheating requirements.

[0021] Furthermore, such as Figure 1 As shown, one end of the bypass branch pipe 6 can be sealed and connected to the hot side inlet of the first heat exchanger 1, meaning that the high-temperature gas generated by the ammonia catalytic reaction can serve as the heat source for preheating the ammonia in the first heat exchanger 1. Simultaneously, since a second flow control valve 9 is installed on the bypass branch pipe 6, and this second flow control valve 9 can be electrically connected to the first flow control valve 7 and the temperature sensor 8, it can further ensure that the ammonia gas introduced into the ammonia catalytic combustion reactor 3 meets the preheating requirements.

[0022] In this embodiment, one end of the exhaust pipe 5 is sealed to the hot-side inlet of the second heat exchanger 2, and the hot-side outlet of the first heat exchanger 1 is sealed to a first waste pipe 10 that forms a passage with the exhaust pipe 5. Simultaneously, the hot-side outlet of the first heat exchanger 1 can be connected to the first waste pipe 10 via a second waste pipe 11. This allows the "high-temperature gas" that has completed heat energy conversion to be centrally discharged.

[0023] Working Principle: In actual use, the ammonia gas discharged from the nitriding furnace 12 can enter the ammonia catalytic combustion reactor 3 through the vent pipe 4. Under the action of the ammonia catalytic combustion reactor 3, the ammonia gas can be decomposed into nitrogen gas and water, which are non-polluting to the environment. The nitrogen gas can be discharged from the exhaust pipe 5 along with the high-temperature air. During this process, part of the high-temperature gas discharged from the exhaust pipe 5 can be introduced into the first heat exchanger 1 installed on the vent pipe 4 through the bypass branch pipe 6, thus serving as a heat source for preheating the ammonia gas. The other part of the high-temperature gas discharged from the exhaust pipe 5 can also serve as a heat source for the second heat exchanger 2, allowing the second heat exchanger 2 to apply the heat from the heat source to other equipment.

[0024] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A heat energy recycling system based on the catalytic decomposition of ammonia, characterized in that: It includes an ammonia processing unit, a first heat exchanger (1), and a second heat exchanger (2); The ammonia treatment unit includes an ammonia catalytic combustion reactor (3) for decomposing ammonia and a vent pipe (4) for introducing ammonia discharged from the nitriding furnace (12) into the ammonia catalytic combustion reactor (3). A first heat exchanger (1) is provided on the vent pipe (4). An exhaust pipe (5) for connecting to a second heat exchanger (2) is provided on the ammonia catalytic combustion reactor (3). A bypass branch pipe (6) for connecting to the first heat exchanger (1) is provided on the exhaust pipe (5).

2. The heat energy recycling system based on ammonia catalytic decomposition according to claim 1, characterized in that: The ventilation pipe (4) includes a first section that is sealed at one end to the exhaust port of the nitriding furnace (12) and a second section that is sealed at one end to the inlet of the ammonia catalytic combustion reactor (3). The other end of the first section is sealed to the cold side inlet of the first heat exchanger (1), and the other end of the second section is sealed to the cold side outlet of the first heat exchanger (1). The first section and the second section on the vent pipe (4) can form a passage with the first heat exchanger (1).

3. The heat energy recycling system based on ammonia catalytic decomposition according to claim 2, characterized in that: A first flow control valve (7) is provided on the first section of the vent pipe (4).

4. The heat energy recycling system based on ammonia catalytic decomposition according to claim 2, characterized in that: A temperature sensor (8) for monitoring the temperature of the internal circulating medium is provided on the second section of the vent pipe (4).

5. The heat energy recycling system based on ammonia catalytic decomposition according to claim 1, characterized in that: One end of the bypass branch pipe (6) can be sealed and connected to the hot side inlet of the first heat exchanger (1).

6. The heat energy recycling system based on ammonia catalytic decomposition according to claim 1, characterized in that: A second flow control valve (9) is installed on the bypass branch pipe (6).

7. The heat energy recycling system based on ammonia catalytic decomposition according to claim 1, characterized in that: One end of the exhaust pipe (5) is sealed to the hot side inlet of the second heat exchanger (2), and the hot side outlet of the first heat exchanger (1) is sealed to a first waste pipe (10) that can form a passage with the exhaust pipe (5).

8. The heat energy recycling system based on ammonia catalytic decomposition according to claim 7, characterized in that: The hot side outlet of the first heat exchanger (1) can be connected to the first waste pipe (10) through the second waste pipe (11).

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