Compressed air heating system for urea spray gun of urea pyrolyzing furnace and use method of compressed air heating system

Abstract

The invention discloses a urea pyrolyzing furnace urea spray gun compressed air heating system which comprises a urea pyrolyzing furnace, a urea spray gun, a heater, an air inlet pipe and an air outlet pipe. An air inlet suitable for being connected with a heat source is formed in the urea pyrolyzing furnace; the heater is located between the urea pyrolyzing furnace and the heat source and communicates with the air inlet; the gas inlet pipe comprises a first gas pipe communicated with the heater and a second gas pipe communicated with the urea spray gun; the air outlet pipe is communicated between the heater and the second air pipe. The heater is communicated with an air inlet pipe for conveying compressed air, part of the compressed air passes through the heater, then flows through a second air pipe and then is output into the urea spray gun, the other part of the compressed air is conveyed to the urea spray gun through the second air pipe, and original cold compressed air and heated compressed air are mixed in the second air pipe and heated; at the moment, the heated compressed air enters the urea spray gun to prevent the inside of the urea spray gun from being crystallized and blocked, so that the ammonia production reliability of the urea pyrolyzing furnace is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of denitration, and in particular to a method for using a compressed air heating system of a urea spray gun of a urea pyrolysis furnace. Background Art

[0002] The compressed air heating system for the urea spray gun of the urea pyrolysis furnace is an important device used to heat the compressed air supporting the spray gun to assist in solving the problem of urea crystallization blockage and ensure the stable operation of the system.

[0003] Heating compressed air using the urea pyrolysis furnace's heat removal system is a technical means of recycling waste heat and reducing energy consumption. The urea pyrolysis furnace is the core equipment for urea pyrolysis to produce ammonia. By burning fuel or utilizing other heat sources, the urea solution decomposes at high temperatures into ammonia and other products. The urea spray gun is a key piece of equipment in the urea pyrolysis furnace's ammonia production process. It is primarily used to spray the urea solution into the pyrolysis furnace, causing it to decompose at high temperatures to produce ammonia. It serves as a crucial link between urea solution delivery and the pyrolysis reaction.

[0004] Most of the existing coal-fired units have installed denitrification systems and widely use urea pyrolysis ammonia production systems. Since the temperature of the urea solution gradually decreases when entering the urea pyrolysis furnace, it is easy for the urea solution to crystallize and become blocked after entering the urea spray gun, which can easily cause the urea pyrolysis furnace to malfunction, causing the denitrification system to work abnormally and the nitrogen oxide emission concentration to exceed the standard, resulting in unit shutdown and affecting the safe, environmental and economic operation of the unit. Summary of the Invention

[0005] Therefore, the present invention aims to solve the problem in the prior art that urea spray guns are prone to crystallization and lead to blockage, thereby providing a method for using a compressed air heating system for a urea spray gun of a urea pyrolysis furnace.

[0006] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0007] A urea pyrolysis furnace urea spray gun compressed air heating system, comprising:

[0008] A urea pyrolysis furnace is provided with an air inlet and a feed inlet, wherein the air inlet is suitable for connecting to a heat source;

[0009] a urea spray gun connected to the feed port;

[0010] a heater, located between the urea pyrolysis furnace and the heat source and connected to the air inlet;

[0011] an air intake pipe connected to the heater, comprising a first air pipe connected to the heater and a second air pipe connected to the urea spray gun;

[0012] The air outlet pipe is connected between the heater and the second air pipe.

[0013] Furthermore, the first air pipe is provided with a first flow regulating structure, the second air pipe is provided with a second flow regulating structure, and the air outlet pipe is provided with a third flow regulating structure located between the first air pipe and the air outlet pipe.

[0014] Furthermore, the first flow regulating structure and the third flow regulating structure are both provided with a temperature monitoring structure.

[0015] Furthermore, the urea pyrolysis furnace is connected to the heat source through a hot air delivery pipe, and the heater is connected to the hot air delivery pipe; a shunt pipe connected between the first air pipe and the hot air communication pipe is provided in the heater.

[0016] Furthermore, a mixing tank is provided on the second air pipe between the air outlet pipe and the urea spray gun.

[0017] Furthermore, the mixed flow tank is provided with a flow delivery regulating structure and a temperature detection structure.

[0018] A method for using the compressed air heating system for a urea spray gun in a urea pyrolysis furnace as described in any one of the above items comprises the following steps:

[0019] S1: When the primary air heat source enters the urea pyrolysis furnace, the compressed air is heated by using the primary air;

[0020] S2: The heated compressed air and the unheated original cold compressed air are combined into the same pipe and then enter the urea spray gun.

[0021] Furthermore, in step S1, a heating structure is provided between the heat source and the urea pyrolysis furnace, part of the primary air is output to the urea pyrolysis furnace, and part is output to the heating structure, and part of the output compressed air enters the heating structure and is heated before being output.

[0022] Furthermore, in the step S1, part of the original cold compressed air is heated before being output, and part is directly output; in the step S2, the heated compressed air is output and then merged with the output original cold compressed air, and then enters the urea spray gun.

[0023] Furthermore, the output flow rate of the heated compressed air after being output can be adjusted before heating, and the output flow rate can also be adjusted after heating; the output flow rate of the original cold compressed air after being output can be adjusted before merging with the heated compressed air.

[0024] The technical solution of the present invention has the following advantages:

[0025] 1. A method for using a compressed air heating system for a urea spray gun in a urea pyrolysis furnace provided by the present invention comprises the following steps: connecting a heater with an air inlet pipe for conveying compressed air, allowing part of the compressed air to pass through the heater through a first air pipe and then flow through a second air pipe and then be output to the urea spray gun; at the same time, part of the compressed air is directly delivered to the urea spray gun through the second air pipe; the original cold compressed air and the heated compressed air are mixed and their temperature is increased in the second air pipe, and then delivered to the urea spray gun; at this time, the heated compressed air enters the urea spray gun to prevent crystallization and blockage inside the urea spray gun, thereby improving the reliability of ammonia production in the urea pyrolysis furnace; this method of simultaneously outputting and mixing the original cold compressed air and the heated compressed air into the urea spray gun can avoid the state change of the compressed air due to all being heated, and can effectively maintain the use state of the compressed air; at the same time, the cold and hot compressed air are separately delivered through the first air pipe and the second air pipe, which can facilitate maintenance in the event of a fault.

[0026] 2. The present invention provides a method for using a compressed air heating system for a urea spray gun in a urea pyrolysis furnace. The system comprises a first flow regulating structure provided on the first air pipe, a second flow regulating structure provided on the second air pipe, and a third flow regulating structure provided on the outlet pipe, located between the first and outlet pipes. By providing the first, second, and third flow regulating structures, the compressed air delivery flow rates within the first, second, and outlet pipes can be individually controlled, effectively ensuring delivery accuracy.

[0027] 3. In the method for using the compressed air heating system for the urea spray gun of a urea pyrolysis furnace provided by the present invention, both the first and third flow regulating structures are equipped with temperature monitoring structures. This arrangement enables real-time monitoring of the temperature of the heated compressed air output from the outlet pipe and the temperature of the raw, cold compressed air output from the second pipe, thereby facilitating real-time control of the output flow rates of the heated compressed air and the raw, cold compressed air.

[0028] 4. The present invention provides a method for using a compressed air heating system for a urea pyrolysis furnace urea spray gun. The urea pyrolysis furnace is connected to a heat source via a hot air delivery pipe, and a heater is connected to the hot air delivery pipe. A shunt pipe is provided within the heater, connecting the first air pipe and the hot air connection pipe. This arrangement diverts some of the hot air from the existing heating structure of the urea pyrolysis furnace to heat the compressed air, eliminating the need for additional heating equipment and requiring only connecting pipes, significantly saving equipment costs.

[0029] 5. In the method for using the compressed air heating system for the urea spray gun in a urea pyrolysis furnace provided by the present invention, a mixing tank is installed on the second air pipe between the air outlet pipe and the urea spray gun. This arrangement can enhance mixing between the original cold compressed air and the heated compressed air, thereby ensuring a uniform temperature of the compressed air entering the urea spray gun.

[0030] 6. The present invention provides a method for using a compressed air heating system for a urea spray gun in a urea pyrolysis furnace. The system includes a flow rate adjustment mechanism and a temperature detection mechanism on the mixing tank. This arrangement allows for real-time measurement of the temperature of the compressed air delivered from the mixing tank to the urea spray gun, facilitating real-time control and adjustment of the output compressed air flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a structural schematic diagram of the compressed air heating system for the urea spray gun of the urea pyrolysis furnace provided by the present invention.

[0033] Explanation of the accompanying symbols: 1. urea dissolving furnace; 2. Compressed air; 3. Raw material; 4. Heat source; 5. Urea spray gun; 6. Heater; 7. First air pipe; 8. Second air pipe; 9. Air outlet pipe; 10. Hot air conveying pipe; 11. First flow regulating structure; 12. Second flow regulating structure; 13. Third flow regulating structure. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 The illustrated system comprises a urea pyrolysis furnace and a urea spray gun compressed air heating system, comprising a urea pyrolysis furnace, a urea spray gun 5, a heater 6, an air inlet pipe, and an air outlet pipe 9. The urea pyrolysis furnace is provided with an air inlet and a feed port, and the air inlet is suitable for connecting to a heat source 4. The urea spray gun 5 is connected to the feed port, and the feed port is suitable for inputting an ammonia-making raw material 3. The heater 6 is located between the urea pyrolysis furnace and the heat source 4 and is connected to the air inlet. The air inlet pipe is connected to the heater 6 and comprises a first air pipe 7 connected to the heater 6 and a second air pipe 8 connected to the urea spray gun 5. The air outlet pipe 9 is connected between the heater 6 and the second air pipe 8.

[0039] This urea pyrolysis furnace urea spray gun compressed air heating system connects the heater 6 with the air inlet pipe for conveying compressed air 2, and allows part of the compressed air 2 to pass through the heater 6 through the first air pipe 7 and then flow through the second air pipe 8 and then be output to the urea spray gun 5. At the same time, part of the compressed air 2 is directly conveyed to the urea spray gun 5 through the second air pipe 8. The original cold compressed air and the heated compressed air are mixed and the temperature is increased in the second air pipe 8, and then are conveyed to the urea spray gun 5. At this time, the heated compressed air 2 enters the urea spray gun 5 to prevent internal crystallization and blockage, thereby improving the reliability of ammonia production in the urea pyrolysis furnace; this method of simultaneously outputting and mixing the original cold compressed air and the heated compressed air into the urea spray gun 5 can avoid the state change of the compressed air 2 due to being fully heated, and can effectively maintain the use state of the compressed air 2. At the same time, the cold and hot compressed air are conveyed separately through the first air pipe 7 and the second air pipe 8, which can facilitate maintenance in the event of a fault.

[0040] In this embodiment, a first flow regulating structure 11 is provided on the first air pipe 7, a second flow regulating structure 12 is provided on the second air pipe 8, and a third flow regulating structure 13 is provided on the air outlet pipe 9, located between the first air pipe 7 and the air outlet pipe 9. With this arrangement, by providing the first flow regulating structure 11, the second flow regulating structure 12, and the third flow regulating structure 13, the flow rates of the compressed air 2 delivered in the first air pipe 7, the second air pipe 8, and the air outlet pipe 9 can be controlled one by one, effectively controlling the delivery accuracy.

[0041] Specifically, both the first flow regulating structure 11 and the third flow regulating structure 13 are provided with temperature monitoring structures. This arrangement allows for real-time monitoring of the temperature of the heated compressed air output from the air outlet pipe 9 and the temperature of the original cold compressed air output from the second air pipe 8, thereby facilitating real-time control of the output flow rates of the heated compressed air and the original cold compressed air.

[0042] In this embodiment, the urea pyrolysis furnace is connected to the heat source 4 via a hot air delivery pipe 10, and the heater 6 is connected to the hot air delivery pipe 10. A diverter pipe is provided within the heater 6, connecting the first air pipe 7 and the hot air connection pipe. This arrangement diverts some of the hot air from the existing heating structure of the urea pyrolysis furnace to heat the compressed air, eliminating the need for additional heating equipment and requiring only connecting pipes, significantly saving equipment costs.

[0043] In an alternative embodiment, a mixing tank is installed on the second air pipe 8 between the air outlet pipe 9 and the urea spray gun 5. This configuration enhances mixing between the original cold compressed air and the heated compressed air, thereby ensuring a uniform temperature of the compressed air 2 entering the urea spray gun 5. Specifically, the mixing tank is equipped with a flow rate adjustment structure and a temperature detection structure. This configuration allows for real-time measurement of the temperature of the compressed air 2 delivered from the mixing tank to the urea spray gun 5, facilitating real-time control and adjustment of the output flow rate of the compressed air 2.

[0044] A method for using a compressed air heating system for a urea spray gun in a urea pyrolysis furnace comprises the following steps:

[0045] S1: When the primary air heat source 4 enters the urea pyrolysis furnace, the compressed air 2 is heated by the primary air;

[0046] S2: The heated compressed air and the unheated original cold compressed air are combined into the same pipe and then enter the urea spray gun 5.

[0047] In step S1, a heating structure is set between the heat source 4 and the urea pyrolysis furnace. Part of the primary air is output to the urea pyrolysis furnace and part is output to the heating structure. Part of the output compressed air 2 enters the heating structure and is heated before being output.

[0048] In step S1, part of the original cold compressed air is heated before being output, and part is directly output; in step S2, the heated compressed air is output and merged with the output original cold compressed air, and then enters the urea spray gun 5.

[0049] Specifically, the output flow rate of the heated compressed air after being output can be adjusted before heating, and the output flow rate can also be adjusted after heating; the output flow rate of the original cold compressed air after being output can be adjusted before merging with the heated compressed air.

[0050] In summary, the urea spray gun compressed air heating system of the urea pyrolysis furnace connects the heater 6 with the air inlet pipe for conveying compressed air 2, and allows part of the compressed air 2 to pass through the heater 6 through the first air pipe 7 and then flow through the second air pipe 8 and then be output to the urea spray gun 5. At the same time, part of the compressed air 2 is directly conveyed to the urea spray gun 5 through the second air pipe 8. The original cold compressed air and the heated compressed air will be mixed and the temperature will be increased in the second air pipe 8, and then be conveyed to the urea spray gun 5. At this time, the heated compressed air 2 enters the urea spray gun 5 to prevent internal crystallization and blockage, thereby improving the reliability of ammonia production in the urea pyrolysis furnace; this method of simultaneously outputting and mixing the original cold compressed air and the heated compressed air into the urea spray gun 5 can avoid the state change of the compressed air 2 due to being heated, and can effectively maintain the use state of the compressed air 2. At the same time, the cold and hot compressed air are conveyed separately through the first air pipe 7 and the second air pipe 8, which can be conveniently repaired in case of failure.

[0051] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A urea pyrolysis furnace urea spray gun compressed air heating system, characterized in that: include: A urea pyrolysis furnace is provided with an air inlet and a feed inlet, wherein the air inlet is suitable for connecting to a heat source (4); a urea spray gun (5), connected to the feed port; a heater (6), located between the urea pyrolysis furnace and the heat source (4), and connected to the air inlet; an air intake pipe connected to the heater (6), comprising a first air pipe (7) connected to the heater (6) and a second air pipe (8) connected to the urea spray gun (5); An air outlet pipe (9) is connected between the heater (6) and the second air pipe (8).

2. The urea pyrolysis furnace urea spray gun compressed air heating system according to claim 1, characterized in that: The first air pipe (7) is provided with a first flow regulating structure (11), the second air pipe (8) is provided with a second flow regulating structure (12), and the air outlet pipe (9) is provided with a third flow regulating structure (13) located between the first air pipe (7) and the air outlet pipe (9).

3. The urea pyrolysis furnace urea spray gun compressed air heating system according to claim 2, characterized in that: The first flow regulating structure (11) and the third flow regulating structure (13) are both provided with temperature monitoring structures.

4. The urea pyrolysis furnace urea spray gun compressed air heating system according to claim 1, characterized in that: The urea pyrolysis furnace is connected to the heat source (4) via a hot air delivery pipe (10), and the heater (6) is connected to the hot air delivery pipe (10); a shunt pipe connected between the first air pipe (7) and the hot air connecting pipe is provided in the heater (6).

5. The urea pyrolysis furnace urea spray gun compressed air heating system according to claim 1, characterized in that: The second air pipe (8) is provided with a mixing tank on the pipeline between the air outlet pipe (9) and the urea spray gun (5).

6. The compressed air heating system for the urea spray gun of the urea pyrolysis furnace according to claim 5, characterized in that: The mixed flow tank is provided with a flow delivery regulating structure and a temperature detecting structure.

7. A method for using the compressed air heating system for a urea spray gun in a urea pyrolysis furnace according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: When the primary air heat source (4) enters the urea pyrolysis furnace, the compressed air (2) is heated by the primary air; S2: The heated compressed air and the unheated original cold compressed air are combined into the same pipe and then enter the urea spray gun (5).

8. The method for using the compressed air heating system for the urea spray gun of a urea pyrolysis furnace according to claim 7, characterized in that: In the step S1, a heating structure is provided between the heat source (4) and the urea pyrolysis furnace, part of the primary air is output to the urea pyrolysis furnace, and part is output to the heating structure, and part of the output compressed air (2) enters the heating structure and is heated before being output.

9. The method for using the compressed air heating system for the urea spray gun of a urea pyrolysis furnace according to claim 7, characterized in that: In the step S1, part of the original cold compressed air is heated before being output, and part is directly output; in the step S2, the heated compressed air is output and then merged with the output original cold compressed air, and then enters the urea spray gun (5).

10. The method for using the compressed air heating system for the urea spray gun of a urea pyrolysis furnace according to claim 9, characterized in that: The output flow rate of the heated compressed air after output can be adjusted before heating, and the output flow rate can also be adjusted after heating; the output flow rate of the original cold compressed air after output can be adjusted before merging with the heated compressed air.

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