A hierarchical control urea hydrolysis steam supply system and equipment

Abstract

The utility model relates to flue gas denitration technical field especially, it relates to a kind of urea hydrolysis's hierarchical control steam supply system and equipment to solve the problem of big pressure fluctuation in the steam supply process in prior art, parameter control is not accurate. Urea hydrolysis's hierarchical control steam supply system includes: primary regulation unit, secondary regulation unit, tertiary regulation unit, dilution air heater, multiple heat tracing steam distribution station, multiple end adjustment parts, main pipeline, first branch pipeline, multiple second branch pipelines and multiple third branch pipelines, primary regulation unit, secondary regulation unit and tertiary regulation unit are connected in series by main pipeline;Primary regulation unit is communicated with dilution air heater by first branch pipeline, for heating dilution air.The urea hydrolysis's hierarchical control steam supply system and equipment provided by the utility model are used in urea hydrolysis.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to a graded control steam supply system and equipment for urea hydrolysis. Background Technology

[0002] In the urea hydrolysis process, steam is the key heat energy source, and the stability and precision of its supply play a crucial role, directly affecting the efficiency of the hydrolysis reaction, product quality, and the overall operational stability of the system. However, the urea hydrolysis system has many steam-consuming devices, and the steam parameter requirements of different devices vary under different operating conditions.

[0003] Currently, urea hydrolysis systems typically use cold resteam as the steam source. However, cold resteam pressure fluctuates significantly, especially during rapid changes in unit load. Failure to stably control steam parameters according to process requirements can severely impact the normal operation of the urea hydrolysis system. Unstable pressure can lead to fluctuations in the hydrolysis reaction rate, affecting the amount and purity of ammonia produced. Inaccurate temperature control may prevent the hydrolysis process from proceeding under optimal conditions, reducing reaction efficiency and potentially causing equipment malfunctions or safety hazards.

[0004] Therefore, how to solve the problems of large pressure fluctuations and inaccurate parameter control in the steam supply process in the existing technology is one of the important problems that urgently need to be solved in this field. Utility Model Content

[0005] In view of this, the present invention provides a graded control steam supply system and equipment for urea hydrolysis to solve the problems of large pressure fluctuations and inaccurate parameter control in the steam supply process in the prior art.

[0006] According to one aspect of this utility model, a graded control steam supply system for urea hydrolysis is provided. The graded control steam supply system for urea hydrolysis includes: a primary control unit, a secondary control unit, a tertiary control unit, a dilution air heater, multiple heated steam distribution stations, multiple terminal regulators, a main pipeline, a first branch pipeline, multiple second branch pipelines, and multiple third branch pipelines. The primary control unit, secondary control unit, and tertiary control unit are connected in series via the main pipeline. The primary control unit is connected to the dilution air heater via the first branch pipeline for heating the dilution air. The secondary control unit is connected to each heated steam distribution station via each second branch pipeline, and each heated steam distribution station supplies heat to the main pipeline connecting the secondary and tertiary control units. The tertiary control unit is connected to each terminal regulator via each third branch pipeline, and each terminal regulator is used to realize urea hydrolysis.

[0007] The primary regulating unit includes a first pressure regulating element, a first sensing element, and a first flow control element. The first pressure regulating element, the first sensing element, and the first flow control element are all located on the primary regulating unit. The first pressure regulating element is used to regulate the pressure of the output steam of the primary regulating unit, the first sensing element is used to monitor the steam temperature of the primary regulating unit, and the first flow control element is used to control the steam flow of the primary regulating unit.

[0008] The secondary regulating unit includes a second pressure regulating element, a second flow control element, and a second sensing element. The second pressure regulating element, the second sensing element, and the second flow control element are all located on the secondary regulating unit. The second pressure regulating element is used to maintain the output pressure of the secondary regulating unit stable. The second flow control element is used to regulate the steam flow rate into the second branch pipe. The second sensing element is used to monitor the pressure inside the secondary regulating unit.

[0009] According to one aspect of the present invention, a graded control steam supply system for urea hydrolysis includes a three-stage regulating unit comprising a third pressure regulating component, a third flow control component, and a third sensing component. The third pressure regulating component, the third sensing component, and the third flow control component are all disposed on the three-stage regulating unit. The third pressure regulating component is used to regulate the pressure of the output steam of the three-stage regulating unit, the third flow control component is used to regulate the steam flow rate into each terminal regulating component, and the third sensing component is used to monitor the pressure within the three-stage regulating unit.

[0010] According to one aspect of the present invention, a graded control steam supply system for urea hydrolysis is provided, wherein a three-stage regulating unit is connected in parallel with each end regulating component.

[0011] According to one aspect of the present invention, a graded control steam supply system for urea hydrolysis includes multiple terminal regulating components: a urea hydrolyzer, a urea dissolving tank, and a urea solution storage tank. The urea hydrolyzer, the urea dissolving tank, and the urea solution storage tank are all connected to a three-stage regulating unit through each third branch pipe.

[0012] According to one aspect of the present invention, a graded control steam supply system for urea hydrolysis includes a steam distribution pipe disposed inside the urea hydrolyzer.

[0013] The steam distribution pipe is a spiral steam distribution pipe.

[0014] According to one aspect of the present invention, a graded control steam supply system for urea hydrolysis is provided, wherein a plurality of steam injection holes are uniformly provided on the steam distribution pipe.

[0015] According to one aspect of the present invention, the graded control steam supply system for urea hydrolysis includes a urea dissolving tank and a urea solution storage tank, both of which are coil-type heaters; the operating temperature of both the urea dissolving tank and the urea solution storage tank is 160℃-180℃.

[0016] According to one aspect of the present invention, a graded and controlled steam supply system for urea hydrolysis is provided in a urea dissolving tank, wherein a first heating element and a fourth sensing element are provided inside the urea dissolving tank, the first heating element is used to supply heat to the urea dissolving tank, and the fourth sensing element is used to monitor the temperature of the urea dissolving tank.

[0017] The urea solution storage tank is also equipped with a second heating element and a fifth sensing element. The second heating element is used to heat the urea solution storage tank, and the fifth sensing element is used to monitor the temperature of the urea solution storage tank.

[0018] According to one aspect of the present invention, the pressure of the graded control steam supply system for urea hydrolysis is 1.0MPa-1.5MPa when the first-level regulating unit is in operation; and the pressure of the second-level regulating unit is 0.6MPa-1.5MPa when in operation.

[0019] According to another aspect of the present invention, a graded control steam supply device for urea hydrolysis is provided, including the above-mentioned graded control steam supply system for urea hydrolysis.

[0020] The above-mentioned technical solutions adopted in this embodiment of the utility model can achieve the following beneficial effects: In the above-mentioned graded regulation steam supply system for urea hydrolysis, steam first enters the primary regulation unit, and the steam pressure is reduced to the set value by the first pressure regulator, laying the foundation for subsequent graded regulation. The first sensor monitors the steam temperature in real time. If the temperature is abnormal, the system can adjust the heat source in conjunction with the system. The first flow controller controls the steam flow rate entering the first branch pipe according to the downstream demand, ensuring that the dilution air heater obtains a stable heat source. The heated dilution air is used for dilution or safety protection in the urea hydrolysis reaction. The steam after primary regulation enters the secondary regulation unit. The second pressure regulator maintains the output pressure stable, avoiding the impact of upstream fluctuations on the heat tracing system. The second flow controller distributes the steam to multiple second branch pipes according to the needs of each heat tracing steam distribution station. Each distribution station heats the main pipe connecting the primary and tertiary regulation units to prevent steam condensation or pipe freezing. At the same time, the second sensor monitors the pressure in the unit and feeds it back to the control system to dynamically adjust the flow distribution. After passing through the secondary unit, the steam enters the tertiary regulation unit and is transported to each terminal regulator through the third branch pipe. The end-point regulator precisely adjusts the steam pressure, flow rate, and temperature according to the real-time requirements of the urea hydrolysis reactor to ensure that the hydrolysis reaction proceeds under optimal conditions.

[0021] Based on the above working process, it can be seen that the first-level regulating unit of the urea hydrolysis graded control steam supply system meets the medium-pressure requirements for dilution air heating; the second-level regulating unit maintains the pipeline temperature through a heat tracing distribution station to prevent steam condensation; and the third-level regulating unit precisely drives urea hydrolysis with low-pressure steam, avoiding the impact of high-pressure steam on the equipment or energy waste. Through the graded regulation of these three units, the system can adapt to the steam demand at different levels in the urea hydrolysis graded control steam supply system, ensuring a stable steam supply. The independent flow control of each branch pipeline can dynamically adjust the steam supply according to different operating conditions, improving system energy efficiency. This effectively solves the problems of large pressure fluctuations and inaccurate parameter control during steam supply in existing technologies. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a graded control steam supply system for urea hydrolysis, provided as an example of this utility model.

[0024] Figure label:

[0025] 1- Primary regulating unit, 2- Secondary regulating unit, 3- Tertiary regulating unit, 4- Dilution air heater, 5- Heated steam distribution station, 6- Terminal regulating component, 61- Urea hydrolyzer, 62- Urea dissolving tank, 63- Urea solution storage tank, 7- Main pipeline, 8- First branch pipeline, 9- Second branch pipeline, 10- Third branch pipeline. Detailed Implementation

[0026] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the accompanying drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0027] It should be understood that the steps described in the method embodiments of this utility model may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this utility model is not limited in this respect.

[0028] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0029] It should be noted that the terms "a" and "a plurality of" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0030] The names of the messages or information exchanged between the multiple devices in this embodiment of the invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0031] In the urea hydrolysis process, steam is the key heat energy source, and the stability and precision of its supply play a crucial role, directly affecting the efficiency of the hydrolysis reaction, product quality, and the overall operational stability of the system. However, the urea hydrolysis system has many steam-consuming devices, and the steam parameter requirements of different devices vary under different operating conditions.

[0032] Currently, urea hydrolysis systems typically use cold resteam as the steam source. However, cold resteam pressure fluctuates significantly, especially during rapid changes in unit load. Failure to stably control steam parameters according to process requirements can severely impact the normal operation of the urea hydrolysis system. Unstable pressure can lead to fluctuations in the hydrolysis reaction rate, affecting the amount and purity of ammonia produced. Inaccurate temperature control may prevent the hydrolysis process from proceeding under optimal conditions, reducing reaction efficiency and potentially causing equipment malfunctions or safety hazards.

[0033] To address the aforementioned problems, an exemplary embodiment of this utility model provides a graded control steam supply system and equipment for urea hydrolysis, thereby solving the problems of large pressure fluctuations and inaccurate parameter control during the steam supply process in the prior art.

[0034] A mine dust removal device according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of a graded control steam supply system for urea hydrolysis, provided as an example of this utility model. Figure 1As shown, the graded control steam supply system for urea hydrolysis includes: a primary control unit 1, a secondary control unit 2, a tertiary control unit 3, a dilution air heater 4, multiple heated steam distribution stations 5, multiple terminal regulators 6, a main pipeline 7, a first branch pipeline 8, multiple second branch pipelines 9, and multiple third branch pipelines 10. The primary control unit 1, secondary control unit 2, and tertiary control unit 3 are connected in series via the main pipeline 7. The primary control unit 1 is connected to the dilution air heater 4 via the first branch pipeline 8 and is used to heat the dilution air. The secondary control unit 2 is connected to each heated steam distribution station 5 via each second branch pipeline 9, and each heated steam distribution station 5 is used to heat the main pipeline 7 connecting the secondary control unit 2 and the tertiary control unit 3. The tertiary control unit 3 is connected to each terminal regulator 6 via each third branch pipeline 10, and each terminal regulator 6... Used to achieve urea hydrolysis; the first-stage regulating unit 1 includes a first pressure regulating element, a first sensing element, and a first flow control element. The first pressure regulating element, the first sensing element, and the first flow control element are all located on the first-stage regulating unit 1. The first pressure regulating element is used to regulate the pressure of the output steam of the first-stage regulating unit 1. The first sensing element is used to monitor the steam temperature of the first-stage regulating unit 1. The first flow control element is used to control the steam flow rate of the first-stage regulating unit 1. The second-stage regulating unit 2 includes a second pressure regulating element, a second flow control element, and a second sensing element. The second pressure regulating element, the second sensing element, and the second flow control element are all located on the second-stage regulating unit 2. The second pressure regulating element is used to maintain the output pressure of the second-stage regulating unit 2 stable. The second flow control element is used to regulate the steam flow rate flowing into the second branch pipe 9. The second sensing element is used to monitor the pressure inside the second-stage regulating unit 2.

[0036] In practical applications, such as Figure 1As shown, steam first enters the primary regulating unit 1, where the first pressure regulator reduces the steam pressure to the set value, laying the foundation for subsequent staged regulation. The first sensor monitors the steam temperature in real time; if the temperature is abnormal, the system can adjust the heat source accordingly. The first flow controller controls the steam flow into the first branch pipe 8 based on downstream demand, ensuring a stable heat source for the dilution air heater 4. After adjustment by the primary regulating unit 1, the product gas generated from urea hydrolysis needs to be heated to prevent crystallization due to temperature drop after dilution, ensuring the mixed temperature is at 140℃. The heated dilution air is used for dilution or safety protection in the urea hydrolysis reaction, with a temperature between 150℃ and 180℃. The steam after primary regulation enters the secondary regulating unit 2, where the second pressure regulator maintains a stable output pressure. The product gas temperature generated from urea hydrolysis is between 135℃ and 145℃. Since urea hydrolysis is a reversible reaction, the product gas pipeline needs to be heated throughout to prevent crystallization and pipeline blockage. The heating steam temperature should be at least 30℃ higher than the temperature of the tracing medium to avoid upstream fluctuations affecting the heating system. The second flow control unit distributes steam to multiple second branch pipes 9 according to the needs of each heated steam distribution station 5. Each distribution station heats the main pipe 7 connecting the first and third stage regulating units 3 to prevent steam condensation or pipe freezing. Simultaneously, the second sensor monitors the pressure within the unit and feeds it back to the control system to dynamically adjust the flow distribution. After passing through the second stage unit, the steam enters the third stage regulating unit 3 and is delivered to each terminal regulating unit 6 via the third branch pipe 10. The terminal regulating units 6 precisely adjust the steam pressure, flow rate, and temperature according to the real-time needs of the urea hydrolysis reactor to ensure the hydrolysis reaction proceeds under optimal operating conditions.

[0037] Based on the above working process, it can be seen that the first-level regulating unit 1 of the urea hydrolysis graded control steam supply system meets the medium-pressure requirements for dilution air heating; the second-level regulating unit 2 maintains the pipeline temperature through a heat tracing distribution station to prevent steam condensation; and the third-level regulating unit 3 precisely drives urea hydrolysis with low-pressure steam, avoiding the impact of high-pressure steam on the equipment or energy waste. Through the graded control of these three regulating units, the system can adapt to the steam demand at different levels in the urea hydrolysis graded control steam supply system, ensuring a stable steam supply. The independent flow control of each branch pipeline can dynamically adjust the steam supply according to different operating conditions, improving system energy efficiency. This effectively solves the problems of large pressure fluctuations and inaccurate parameter control during the steam supply process in existing technologies.

[0038] For example, such as Figure 1As shown, the three-stage regulating unit 3 includes a third pressure regulator, a third flow controller, and a third sensor. These three components are all located on the three-stage regulating unit 3. The third pressure regulator regulates the pressure of the output steam of the three-stage regulating unit 3, the third flow controller regulates the steam flow rate into each terminal regulating element 6, and the third sensor monitors the pressure within the three-stage regulating unit 3. Through the synergistic effect of the third pressure regulator and the third flow controller, stable and suitable steam parameters can be provided for the urea hydrolysis reaction. Precise pressure and flow control allows the hydrolysis reaction to proceed under optimal operating conditions, significantly improving the urea hydrolysis efficiency.

[0039] For example, such as Figure 1 As shown, the three-stage regulating unit 3 is connected in parallel with each end regulating component 6. The multiple end regulating components 6 include: urea hydrolyzer 61, urea solution storage tank 6362 and urea solution storage tank. The urea hydrolyzer 61, urea solution storage tank 6362 and urea solution storage tank are all connected to the three-stage regulating unit 3 through each third branch pipe 10.

[0040] In practical applications, such as Figure 1 As shown, the steam pressure is adjusted to the pressure required by the terminal regulator 6 via the third pressure regulator. The three-stage regulating unit 3, through the third flow control component, distributes steam to the corresponding third branch pipes 10 according to the real-time demand of each terminal regulator 6. Each terminal regulator 6 is connected to the three-stage regulating unit 3 via an independent third branch pipe 10, and can be started, stopped, or adjusted independently. This results in a steam supply characterized by centralized control and distributed supply. When process requirements change, the steam supply to each terminal regulator 6 can be quickly changed by adjusting each third branch pipe 10, shortening system adjustment time and improving production efficiency.

[0041] For example, such as Figure 1 As shown, the urea hydrolyzer 61 includes a steam distribution pipe, which is located inside the urea hydrolyzer 61; the steam distribution pipe is a spiral steam distribution pipe. Multiple steam spray holes are evenly distributed on the steam distribution pipe.

[0042] In practical applications, such as Figure 1 As shown, the steam distribution pipe is a spiral steam distribution pipe. The spiral shape can cover the entire height range of the hydrolyzer, extending the contact path between the steam and the urea solution. The steam output from the three-stage regulating unit 3 enters the spiral steam distribution pipe through the third branch pipe 10, and is injected into the urea solution at high speed through the steam spray holes on the pipe wall. The structure of the spiral coil increases the contact area between the steam and the solution and ensures uniform heating. The uniform steam distribution avoids local overheating or low temperature areas, ensuring the hydrolysis rate of urea.

[0043] For example, both the urea solution storage tank 6362 and the urea solution storage tank are coil-type heating; the operating temperature of both the urea solution storage tank 6362 and the urea solution storage tank is 160℃-180℃.

[0044] In practical applications, such as Figure 1 As shown, coil heating delivers heating steam through pipes wound inside or outside the tank. The steam releases heat as it flows within the coil, which is then conducted to the medium inside the tank through the pipe wall. The large contact area between the coil and the medium allows the latent heat released by steam condensation to be quickly transferred to the solution, resulting in rapid heating. The coils can be evenly distributed at the bottom or side walls of the tank, avoiding localized overheating or heating dead zones compared to traditional single-point heating. This ensures a uniform temperature field in the urea solution inside the tank and prevents urea decomposition or crystallization due to excessively high local temperatures.

[0045] For example, such as Figure 1 As shown, the urea solution storage tank 6362 is also equipped with a first heating element and a fourth sensing element. The first heating element is used to heat the urea solution storage tank 6362, and the fourth sensing element is used to monitor the temperature of the urea solution storage tank 6362. The urea solution storage tank is also equipped with a second heating element and a fifth sensing element. The second heating element is used to heat the urea solution storage tank, and the fifth sensing element is used to monitor the temperature of the urea solution storage tank.

[0046] In practical applications, such as Figure 1 As shown, the urea solution storage tank 6362 is equipped with a first heating element and a fourth sensing element, while the urea solution storage tank is equipped with a second heating element and a fifth sensing element. The first or second heating element is typically a steam coil, an electric heating rod, or a jacketed heat exchanger, which will not be listed here. The tank is heated by steam or an independent heat source provided by the three-stage regulating unit 3. It can be understood that the aforementioned fourth or fifth sensing element is a temperature sensor. The fourth sensing element is used to monitor the temperature of the urea solution storage tank 6362, and the fifth sensing element is used to monitor the temperature of the urea solution storage tank. If the temperature of the urea solution storage tank 6362 or the temperature inside the urea solution storage tank is lower than the preset temperature, the heating element will be triggered to adjust the heating power.

[0047] For example, such as Figure 1 As shown, the pressure of primary regulating unit 1 under operating conditions is 1.0MPa-1.5MPa; the pressure of secondary regulating unit 2 under operating conditions is 0.6MPa-1.5MPa. Primary regulating unit 1, as the initial pressure regulating level of the system, is typically connected to the main steam network such as boilers, and its pressure range falls within the medium-high pressure steam range. It provides sufficient pressure margin for subsequent secondary regulating units 2 and tertiary regulating units 3, ensuring that the steam can still meet the pressure requirements of the terminal equipment after multiple stages of pressure reduction. High-pressure steam has a high energy density, which can reduce the size of steam transmission pipelines, lower pipeline investment costs, and improve transmission efficiency.

[0048] An exemplary embodiment of this utility model provides a graded control steam supply device for urea hydrolysis, including the aforementioned graded control steam supply system for urea hydrolysis.

[0049] Compared with the prior art, the beneficial effects of the graded regulation steam supply equipment for urea hydrolysis provided in this embodiment of the utility model are similar to the beneficial effects of the graded regulation steam supply system for urea hydrolysis, and will not be repeated here.

[0050] The above description is merely an illustration of some embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that the scope of this utility model is not limited to the specific combinations of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features of this utility model that have similar functions.

[0051] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A graded steam supply system for urea hydrolysis, characterized in that, The graded control steam supply system for urea hydrolysis includes: a primary control unit, a secondary control unit, a tertiary control unit, a dilution air heater, multiple heat-tracing steam distribution stations, multiple terminal regulators, a main pipeline, a first branch pipeline, multiple second branch pipelines, and multiple third branch pipelines. The primary control unit, the secondary control unit, and the tertiary control unit are connected in series through the main pipeline. The primary control unit is connected to the dilution air heater through the first branch pipeline for heating the dilution air. The secondary control unit is connected to each heat-tracing steam distribution station through each second branch pipeline, and each heat-tracing steam distribution station supplies heat to the main pipeline connecting the secondary control unit and the tertiary control unit. The tertiary control unit is connected to each terminal regulator through each third branch pipeline, and each terminal regulator is used to realize urea hydrolysis. The primary regulating unit includes a first pressure regulating element, a first sensing element, and a first flow control element. The first pressure regulating element, the first sensing element, and the first flow control element are all disposed on the primary regulating unit. The first pressure regulating element is used to regulate the pressure of the output steam of the primary regulating unit, the first sensing element is used to monitor the steam temperature of the primary regulating unit, and the first flow control element is used to control the steam flow of the primary regulating unit. The secondary regulating unit includes a second pressure regulating element, a second flow control element, and a second sensing element. The second pressure regulating element, the second sensing element, and the second flow control element are all disposed on the secondary regulating unit. The second pressure regulating element is used to maintain the output pressure of the secondary regulating unit stable. The second flow control element is used to regulate the steam flow rate flowing into the second branch pipe. The second sensing element is used to monitor the pressure in the secondary regulating unit.

2. The graded control steam supply system for urea hydrolysis according to claim 1, characterized in that, The three-stage regulating unit includes a third pressure regulating element, a third flow control element, and a third sensing element. The third pressure regulating element, the third sensing element, and the third flow control element are all disposed on the three-stage regulating unit. The third pressure regulating element is used to regulate the pressure of the output steam of the three-stage regulating unit. The third flow control element is used to regulate the steam flow rate flowing into each of the terminal regulating elements. The third sensing element is used to monitor the pressure within the three-stage regulating unit.

3. The graded control steam supply system for urea hydrolysis according to claim 1, characterized in that, The three-stage adjustment unit is connected in parallel with each of the end adjustment components.

4. The graded control steam supply system for urea hydrolysis according to claim 3, characterized in that, Multiple end-regulating components include: a urea hydrolyzer, a urea dissolving tank, and a urea solution storage tank. The urea hydrolyzer, the urea dissolving tank, and the urea solution storage tank are all connected to the three-stage regulating unit through each of the third branch pipes.

5. The graded control steam supply system for urea hydrolysis according to claim 4, characterized in that, The urea hydrolyzer includes a steam distribution pipe, which is disposed inside the urea hydrolyzer. The steam distribution pipe is a spiral steam distribution pipe.

6. The graded control steam supply system for urea hydrolysis according to claim 5, characterized in that, The steam distribution pipe is uniformly provided with multiple steam spray holes.

7. The graded control steam supply system for urea hydrolysis according to claim 4, characterized in that, Both the urea dissolving tank and the urea solution storage tank are coil-type heaters; the operating temperature of both the urea dissolving tank and the urea solution storage tank is 160℃-180℃.

8. The graded control steam supply system for urea hydrolysis according to claim 7, characterized in that, The urea dissolving tank is also equipped with a first heating element and a fourth sensing element. The first heating element is used to heat the urea dissolving tank, and the fourth sensing element is used to monitor the temperature of the urea dissolving tank. The urea solution storage tank is also equipped with a second heating element and a fifth sensing element. The second heating element is used to heat the urea solution storage tank, and the fifth sensing element is used to monitor the temperature of the urea solution storage tank.

9. The graded control steam supply system for urea hydrolysis according to claim 1, characterized in that, The pressure of the first-stage regulating unit in operation is 1.0MPa-1.5MPa; the pressure of the second-stage regulating unit in operation is 0.6MPa-1.5MPa.

10. A staged steam supply device for urea hydrolysis, characterized in that, The system includes a graded steam supply system for urea hydrolysis as described in any one of claims 1-9.

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