Urea hydrolysis reactor and method of use

Abstract

The invention relates to the technical field of urea hydrolysis, in particular to a urea hydrolysis reactor and a using method thereof.The urea hydrolysis reactor comprises a urea solution conveying device used for conveying a urea solution to the urea hydrolysis reactor; the hydrolysis reactor comprises a reaction chamber which is used for accommodating the urea solution and promoting the hydrolysis of the urea solution; the saturated steam supply device is used for providing saturated steam as a heat source in the hydrolysis process, the saturated steam is introduced to the outside of the hydrolysis reactor through a coil pipe structure, and the saturated steam and the urea solution are not directly mixed. The device has the beneficial effects that heat loss caused by direct contact of steam and a urea solution is avoided in a coil indirect heat exchange mode, and the heat transfer efficiency is greatly improved. Therefore, compared with a traditional direct contact type heating method, more energy consumption can be saved under the same production condition.

Description

Technical Field

[0001] The invention relates to the technical field of urea hydrolysis, in particular to a urea hydrolysis reactor and a use method thereof. Background Art

[0002] Urea hydrolysis is an important chemical process, widely used in the liquid ammonia to urea system of thermal power plants, waste gas treatment, synthetic ammonia and other industrial fields that require ammonia. Urea can undergo hydrolysis under certain conditions to produce ammonia, carbon dioxide and water. This reaction is usually carried out under high temperature and high pressure, and requires a large amount of external heat energy to drive the reaction.

[0003] The traditional urea hydrolysis method has the problems of high energy consumption and low efficiency. Since the urea hydrolysis reaction is an endothermic reaction, how to effectively provide heat and maintain stable reaction conditions has become the key to improving the efficiency of urea hydrolysis. In the traditional method, heat is often provided by directly injecting steam into the reactor. However, this method easily leads to instability of the reaction medium, affects product quality, and the utilization rate of steam is not high, resulting in energy waste. Summary of the invention

[0004] Some simplifications or omissions may be made in this section and the abstract and title of the present application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] The object of the present invention is to provide a urea hydrolysis reactor.

[0006] Therefore, the purpose is to solve the problem that in traditional methods, heat is often provided by directly injecting steam into the reactor. However, this method easily leads to instability of the reaction medium and low utilization rate of steam, resulting in energy waste.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: a urea hydrolysis reactor, comprising a urea solution conveying device for conveying the urea solution to the urea hydrolysis reactor; a hydrolysis reactor, wherein the hydrolysis reactor comprises a reaction chamber for accommodating the urea solution and promoting its hydrolysis; a saturated steam supply device for providing saturated steam as a heat source for the hydrolysis process, wherein the saturated steam is introduced into the outside of the hydrolysis reactor through a coil structure, and there is no direct mixing between the saturated steam and the urea solution; a reflux mechanism connected to the coil structure for condensing and refluxing the heated steam; a drain tank for receiving condensed water from the reflux mechanism; and a drain pump connected to the drain tank for pumping the condensed water out of the drain tank and recycling it for dissolving urea.

[0008] As a preferred solution of the urea hydrolysis reactor of the present invention, there is a control system, wherein the control system is configured to monitor and control the temperature, pressure of the urea solution and the chemical reaction rate in the hydrolysis reactor.

[0009] As a preferred solution of the urea hydrolysis reactor of the present invention, the urea solution delivery device includes a flow control valve for adjusting the rate at which the urea solution flows into the hydrolysis reactor.

[0010] As a preferred embodiment of the urea hydrolysis reactor of the present invention, the drain pump includes a filter for removing impurities in the condensed water.

[0011] As a preferred embodiment of the urea hydrolysis reactor of the present invention, the saturated steam supply device includes: a first steam inlet pipe, which is configured to receive steam from an industrial steam supply main pipe; a confluence pipe, which connects at least two independent steam source points, the first steam inlet pipe introduces steam from the at least one steam source point and converges it to form a main steam supply; a second steam inlet pipe, which is configured to receive steam from the sootblowing steam main pipe of the unit boiler; the second steam inlet pipe introduces steam from the at least one steam source point and converges it to form a standby steam supply; a temperature reduction and pressure reduction section, which includes at least one group of temperature reduction and pressure reduction equipment, each group includes a working equipment and a standby equipment, and the temperature reduction and pressure reduction section is configured to adjust the pressure and temperature of the steam input from the first steam inlet pipe or the second steam inlet pipe; a controller, which is configured to monitor steam parameters and automatically adjust the working state of the temperature reduction and pressure reduction section according to the operating state of the hydrolysis reactor.

[0012] As a preferred solution of the urea hydrolysis reactor of the present invention, the safety protection unit is configured on the saturated steam supply device, including a safety valve and an alarm device, which can cut off the steam supply in time and send an alarm signal to the controller when the steam parameters exceed the predetermined safety range.

[0013] As a preferred embodiment of the urea hydrolysis reactor of the present invention, the manifold is further configured to merge the steam introduced by the first steam introduction pipe and the steam introduced by the second steam introduction pipe.

[0014] As a preferred solution of the urea hydrolysis reactor of the present invention, the temperature and pressure reduction unit is further configured to dynamically adjust the temperature and pressure of the steam according to the actual operating pressure and temperature in the hydrolysis reactor.

[0015] As a preferred solution of the urea hydrolysis reactor of the present invention, the controller is further configured to receive operation data from the hydrolysis reactor and adjust the working state of the temperature reduction and pressure reduction unit based on the operation data.

[0016] As a preferred embodiment of the urea hydrolysis reactor of the present invention, wherein:

[0017] To solve the above technical problems, the present invention also provides the following technical solutions: a method for using a urea hydrolysis reactor, comprising a urea hydrolysis reactor, and a urea solution is transported to the hydrolysis reactor through a urea solution transporting device; a saturated steam supply device provides steam of required temperature and pressure, and heats the urea solution in the hydrolysis reactor through a coil structure, but does not directly contact the urea solution; a control system monitors and adjusts the temperature and pressure of the urea solution in the hydrolysis reactor, as well as the hydrolysis reaction rate, to ensure optimal hydrolysis conditions; the heated steam condenses and returns to the drain tank through a reflux mechanism; after being purified by a filter in a drain pump, the condensed water is re-pumped into the system for dissolving urea; according to the operating state of the hydrolysis reactor, the controller automatically adjusts the working state of the temperature reduction and pressure reduction unit to maintain the internal operating state of the hydrolysis reactor.

[0018] The beneficial effect of the present invention is that the heat loss caused by direct contact between steam and urea solution is avoided through the indirect heat exchange method of the coil, and the heat transfer efficiency is greatly improved. This means that compared with the traditional direct contact heating method, the present invention can save more energy consumption under the same production conditions.

[0019] The condensate recycling mechanism not only reduces the consumption of new water, but also alleviates the burden of wastewater treatment, playing a positive role in the sustainable management of water resources.

[0020] The dual steam supply design ensures that the device can continue to work uninterruptedly even if one supply path is interrupted. This redundancy mechanism greatly enhances the reliability and stability of the entire production process.

[0021] The present invention reduces energy consumption, improves raw material conversion rate, and prolongs equipment service life, taking into account multiple aspects, and can bring considerable cost savings and profit growth to enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0023] Figure 1 It is a schematic diagram of the first side view structure of the hydrolysis reactor in the present invention.

[0024] Figure 2 It is a second side structural schematic diagram of the hydrolysis reactor in the present invention.

[0025] In the figure:

[0026] 100. Urea solution conveying device; 101. Hydrolysis reactor; 103. Reflux mechanism; 104. Drain tank; 105. Coil; 106. First steam inlet pipe; 107. Converging pipe; 108. Second steam inlet pipe; 109. Temperature reduction and pressure reduction unit. DETAILED DESCRIPTION

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0030] Example 1

[0031] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides a urea hydrolysis reactor, including a urea solution conveying device 100, used for conveying the urea solution to the urea hydrolysis reactor; a hydrolysis reactor 101, wherein the hydrolysis reactor 101 includes a reaction chamber, used for accommodating the urea solution and promoting its hydrolysis; a saturated steam supply device, used for providing saturated steam as a heat source for the hydrolysis process, wherein the saturated steam is introduced into the outside of the hydrolysis reactor 101 through a coil 105 structure, and there is no direct mixing between the saturated steam and the urea solution; a reflux mechanism 103, connected to the coil 105 structure, used for condensing and refluxing the heated steam; a drain tank 104, used for receiving condensed water from the reflux mechanism 103; and a drain pump, connected to the drain tank 104, used for pumping the condensed water out of the drain tank 104 and recycling it for dissolving urea.

[0032] The present embodiment relates to a urea hydrolysis reactor, which is designed to efficiently hydrolyze a urea solution to produce ammonia and other by-products. It is suitable for waste gas treatment in industrial production processes or other application scenarios requiring ammonia.

[0033] The urea solution delivery device 100 is mainly responsible for delivering the pre-prepared urea solution to the hydrolysis reactor 101 according to certain flow and pressure conditions. This part is usually composed of a pump, a pipeline and a control valve, which can ensure the stable and continuous supply of the urea solution. The hydrolysis reactor 101 is provided with one or more reaction chambers inside, which provide sufficient space and conditions for the urea solution to complete the hydrolysis reaction. In the chamber, urea molecules are decomposed into ammonia, carbon dioxide and water under specific temperature and pressure conditions. In order to improve the reaction efficiency, the hydrolysis reactor 101 is usually made of corrosion-resistant materials and equipped with a stirring device to better mix the solution and accelerate the chemical reaction rate.

[0034] The saturated steam supply device provides the required heat for the urea hydrolysis reaction. In this embodiment, the steam does not directly contact the urea solution, but is surrounded by a coil 105 structure on the outside of the hydrolysis reactor 101. When the steam passes through the coil 105, the heat is transferred to the urea solution by convection, thereby promoting the hydrolysis reaction. The advantage of doing so is that the unstable factors of the reaction environment caused by the direct entry of steam into the hydrolysis reactor 101 can be avoided. The reflux mechanism 103 is closely connected to the coil 105 structure, and its function is to collect the steam condensate generated by the heat exchange and guide it to the drain tank 104. The design of this part takes into account the effective recovery and utilization of energy. The drain tank 104 is a container specially used to collect condensate. After the condensate passes through the drain tank 104, it can be recycled again through the connected drain pump. The drain pump not only helps to maintain the closed cycle of the system, but also can adjust the speed of water circulation as needed.

[0035] When the urea hydrolysis reactor is started, the pre-prepared urea solution is first fed into the hydrolysis reactor 101 through the urea solution conveying device 100. At the same time, the saturated steam supply device starts to work, and the steam transfers heat to the urea solution through the coil 105 structure without direct contact with it. As the temperature rises, the urea molecules begin to hydrolyze, producing products such as ammonia. After the heat transfer, the steam condenses into water and flows into the drain tank 104 through the reflux mechanism 103. The drain pump returns the condensed water to the front end of the hydrolysis reactor 101 to be used as water for urea dissolution or other process requirements. In addition, through such a design, energy consumption can be effectively reduced and the overall energy utilization efficiency can be improved.

[0036] The present invention can not only effectively promote the urea hydrolysis reaction, but also realize the recycling of energy to a certain extent, and has good economic benefits and environmental protection value.

[0037] In another embodiment, the design of the urea hydrolysis reactor is further optimized to enhance its performance and improve energy efficiency. For example, catalyst technology can be introduced to reduce the temperature and pressure required for the reaction, thereby making the operating conditions milder, while also accelerating the reaction rate and increasing the yield of ammonia.

[0038] The choice of catalyst can be determined according to the specific urea hydrolysis mechanism. Common catalysts include metal-based catalysts such as platinum, palladium, etc., or composite oxide catalysts. The use of catalysts can not only reduce energy consumption, but also reduce equipment wear and tear and extend the service life of the reactor.

[0039] In addition, the heat exchange efficiency can be increased by improving the design of the coil 105 structure. For example, more efficient heat exchange materials can be used or the geometric shape of the coil 105 can be changed, such as using a spiral structure, to increase the heat exchange area and improve heat distribution, so that the urea solution can be maintained in the optimal temperature range throughout the reaction process.

[0040] The control system is configured to monitor and control the temperature and pressure of the urea solution and the chemical reaction rate in the hydrolysis reactor 101. The urea solution delivery device 100 includes a flow control valve for adjusting the rate at which the urea solution flows into the hydrolysis reactor 101. The drain pump includes a filter for removing impurities in the condensed water to ensure the purity of the recycled water.

[0041] In this embodiment, the urea solution delivery device 100 includes a flow control valve. The function of the flow control valve is to adjust the flow rate of the urea solution entering the hydrolysis reactor 101 according to preset parameters. In order to achieve this function, the control system needs to be closely integrated with the flow control valve, obtain real-time data through sensors, and dynamically adjust the valve opening according to these data.

[0042] Temperature and pressure are key factors affecting the efficiency of urea hydrolysis. Therefore, multiple sensors are installed inside the hydrolysis reactor 101 to monitor the temperature and pressure level of the solution in real time. These sensors transmit information to the control system, which adjusts the working state of the heating element or adjusts the pressure of the system according to the set target value, thereby maintaining the urea solution in the best reaction condition.

[0043] The drain pump is equipped with a special filter to remove impurities that may be present in the condensate. This not only improves the overall performance of the system, but also extends the service life of the equipment.

[0044] After startup, an initialization check is performed to ensure that all sensors and actuators are in normal working condition. Then, the control system starts to monitor the temperature and pressure of the urea solution according to the pre-set parameters. If any deviation from the preset values ​​is detected, the control system will automatically adjust the heating element and pressure regulator, and change the input rate of the urea solution through the flow control valve.

[0045] During the whole process, the chemical reaction rate is also closely monitored. By adjusting the internal environment of the reactor, such as temperature and pressure, the control system can optimize the efficiency of the urea hydrolysis reaction and ensure that the output product meets the expected quality standards. At the same time, the filter on the drain pump continuously removes impurities in the condensate to ensure the purity of the recycled water.

[0046] Example 2

[0047] Reference Figure 1-2 , which is the second embodiment of the present invention, and provides a urea hydrolysis reactor, wherein the saturated steam supply device comprises a first steam introduction pipe 106, which is configured to receive steam from an industrial steam supply main pipe, and the steam provided by the industrial steam supply main pipe has a pressure of about 1 MPa and a temperature of about 200° C.; a confluence pipe 107, which connects at least two independent steam source points, and the first steam introduction pipe 106 introduces steam from at least two steam source points and merges them to form a main steam supply; a second steam introduction pipe 108, which is configured to receive steam from a sootblowing steam main pipe of a unit boiler, and the steam provided by the sootblowing steam main pipe has a pressure of about 1 MPa; The conduit 107 is also connected to at least two steam sources, and the second steam inlet pipe 108 introduces steam from at least two steam sources and converges them to form a standby steam supply; a temperature reduction and pressure reduction section 109, which includes at least one group of temperature reduction and pressure reduction equipment, each group includes a working equipment and a standby equipment, and the temperature reduction and pressure reduction section 109 is configured to adjust the pressure and temperature of the steam input from the first steam inlet pipe 106 or the second steam inlet pipe 108 to meet the operating requirements of the hydrolysis reactor 101; a controller, which is configured to monitor steam parameters and automatically adjust the working state of the temperature reduction and pressure reduction section 109 according to the operating state of the hydrolysis reactor 101.

[0048] In this embodiment, the first steam inlet pipe 106 introduces steam from the industrial steam supply main pipe. The steam provided by the industrial steam supply main pipe usually has a pressure of about 1MPa and a temperature of about 200°C. This part is the main steam source, ensuring the stability and quality of steam supply under normal circumstances. The manifold 107 is a component connecting multiple independent steam sources. It not only connects the first steam inlet pipe 106, but also brings together at least two independent steam source points to form a unified main steam supply. In addition to the main steam supply, the present invention is also equipped with a second steam inlet pipe 108, which can introduce steam from the sootblowing steam main pipe of the unit boiler. This part of steam also has a pressure of about 1MPa. As a backup steam supply, it can be switched in time when there is a problem with the main steam supply, ensuring the continuity of the steam supply. The temperature reduction and pressure reduction unit 109 includes at least one group of temperature reduction and pressure reduction equipment, each group consisting of a working device and a backup device. The purpose of this setting is that when the working equipment needs maintenance or fails, the backup equipment can be put into use immediately, so as not to affect the normal operation of the entire system. The function of the controller is to monitor various parameters of the steam in real time and automatically adjust the working state of the temperature reduction and pressure reduction equipment according to the current operating state of the hydrolysis reactor 101. In this way, the system can dynamically adapt to the changes in demand under different working conditions and optimize the use efficiency of steam.

[0049] The working process of the saturated steam supply device is as follows:

[0050] First, the system receives steam from the industrial steam supply main pipe and / or the unit boiler soot-blowing steam main pipe. These steams are collected together through the manifold 107 to form the main steam supply or the standby steam supply.

[0051] Next, the steam will enter the temperature reduction and pressure reduction section 109. Here, the pressure and temperature of the steam will be adjusted to the requirements suitable for the operation of the urea hydrolysis reactor 101. If necessary, the system will automatically choose to use the main steam supply or the backup steam supply.

[0052] During the adjustment process, the controller monitors the pressure, temperature and other parameters of the steam, and adjusts the state of the temperature reduction and pressure reduction equipment according to actual needs. For example, if the hydrolysis reactor 101 requires a higher temperature, the control system may increase the temperature of the steam; otherwise, it may reduce it.

[0053] In addition, the controller can automatically select which steam source to use and whether to start the backup equipment according to the system's operating conditions, thereby ensuring that the system can maintain stable operation under any circumstances.

[0054] When the steam parameters meet the requirements, they will be transported to the urea hydrolysis reactor 101 to participate in the hydrolysis reaction of urea to produce the desired products.

[0055] Example 3

[0056] Reference Figure 1-2 , which is the third embodiment of the present invention, and provides a urea hydrolysis reactor, a safety protection unit, which is configured on a saturated steam supply device, including a safety valve and an alarm device, which can cut off the steam supply in time and send an alarm signal to the controller when the steam parameters exceed a predetermined safety range. The confluence pipe 107 is further configured to merge the steam introduced by the first steam inlet pipe 106 and the second steam inlet pipe 108 to form a continuous and stable steam supply. The temperature reduction and pressure reduction unit 109 is further configured to dynamically adjust the temperature and pressure of the steam according to the actual operating pressure and temperature in the hydrolysis reactor 101. The controller is further configured to receive operating data from the hydrolysis reactor 101, and adjust the working state of the temperature reduction and pressure reduction unit 109 based on the operating data to maintain the gas-liquid two-phase equilibrium pressure inside the hydrolysis reactor 101 at about 0.4-0.6MPa and the temperature at about 130-160°C.

[0057] In this embodiment, when the steam parameter (such as temperature or pressure) exceeds the predetermined safety range, the safety protection unit can automatically cut off the steam supply and send an alarm signal to the controller. This design ensures that measures can be taken quickly in abnormal situations to prevent accidents.

[0058] The design of the manifold 107 is used to integrate the steam introduced from different sources, that is, to combine the steam from the first steam introduction pipe 106 and the second steam introduction pipe 108 into a stable and continuous steam supply. This can ensure that the urea hydrolysis reactor obtains a consistent steam supply, thereby improving the reaction efficiency and ensuring the consistency of product quality.

[0059] The function of the temperature reduction and pressure reduction unit 109 is to dynamically adjust the state of the steam according to the actual operating conditions, i.e., pressure and temperature, inside the urea hydrolysis reactor 101. In this way, the system can adjust the temperature and pressure of the steam in real time according to actual needs to ensure that the reaction conditions are always at the optimal level.

[0060] The controller is responsible for receiving various operation data from the urea hydrolysis reactor 101, and adjusting the working state of the temperature reduction and pressure reduction unit 109 according to these data. Its goal is to maintain the gas-liquid two-phase equilibrium pressure inside the hydrolysis reactor 101 between 0.4 and 0.6 MPa, and the temperature is maintained at about 130 to 160 degrees Celsius. By precisely controlling these parameters, the complete hydrolysis of urea can be effectively promoted while avoiding unnecessary energy consumption and equipment damage.

[0061] Method of using the urea hydrolysis reactor, startup steps; perform initialization checks to confirm that the components are working properly. Turn on the steam supply device as needed to allow steam to preheat the hydrolysis reactor 101 through the coil 105. Start the urea solution delivery device 100 to deliver the urea solution to the hydrolysis reactor 101 according to the set flow control valve parameters. Adjust the steam supply according to the temperature and pressure feedback in the hydrolysis reactor 101 to ensure stable reaction conditions. Continuously monitor the various parameters in the urea hydrolysis reactor and adjust them when necessary to maintain the optimal reaction conditions.

[0062] Shutdown step: After the required urea hydrolysis is completed, gradually reduce the steam supply until it is completely shut down. Turn off the urea solution delivery device 100 and stop delivering urea solution to the hydrolysis reactor 101. After the temperature inside the reactor drops to a safe level, turn off the control system. Clean the impurities in the system regularly, especially the filter on the drain pump, to ensure the purity of the recycled water.

[0063] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0064] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0065] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. Urea hydrolysis reactor, characterized in that: include, A urea solution conveying device (100), used for conveying the urea solution to a urea hydrolysis reactor; A hydrolysis reactor (101), the hydrolysis reactor (101) comprising a reaction chamber for containing the urea solution and promoting its hydrolysis; a saturated steam supply device for providing saturated steam as a heat source for the hydrolysis process, wherein the saturated steam is introduced into the outside of the hydrolysis reactor (101) through a coil (105) structure, and there is no direct mixing between the saturated steam and the urea solution; A reflux mechanism (103), connected to the coil (105) structure, for condensing and refluxing the heated steam; A drain tank (104), used for receiving condensed water from the reflux mechanism (103); A drain pump is connected to the drain tank (104) and is used to pump the condensed water out of the drain tank (104) and recycle it for dissolving urea.

2. The urea hydrolysis reactor according to claim 1, wherein: A control system is configured to monitor and control the temperature, pressure and chemical reaction rate of the urea solution in the hydrolysis reactor (101).

3. The urea hydrolysis reactor according to claim 2, characterized in that: The urea solution delivery device (100) comprises a flow control valve for adjusting the rate at which the urea solution flows into the hydrolysis reactor (101).

4. The urea hydrolysis reactor according to claim 3, characterized in that: The drain pump comprises a filter for removing impurities in the condensed water.

5. The urea hydrolysis reactor according to claim 1, characterized in that: The saturated steam supply device comprises: A first steam introduction pipe (106) configured to receive steam from an industrial steam supply main pipe; A confluence pipe (107) connecting at least two independent steam source points, wherein the first steam introduction pipe (106) introduces steam from the at least one steam source point and converges the steam to form a main steam supply; a second steam introduction pipe (108) configured to receive steam from a sootblowing steam main pipe of a unit boiler; The second steam introduction pipe (108) introduces steam from the at least one steam source point and merges the steam to form a standby steam supply; a temperature reduction and pressure reduction unit (109), comprising at least one set of temperature reduction and pressure reduction equipment, each set comprising a working equipment and a standby equipment, the temperature reduction and pressure reduction unit (109) being configured to adjust the pressure and temperature of the steam input from the first steam introduction pipe (106) or the second steam introduction pipe (108); The controller is configured to monitor steam parameters and automatically adjust the working state of the temperature reduction and pressure reduction unit (109) according to the operating state of the hydrolysis reactor (101).

6. The urea hydrolysis reactor according to claim 5, characterized in that: The safety protection unit is configured on the saturated steam supply device and includes a safety valve and an alarm device. When the steam parameters exceed a predetermined safety range, the steam supply can be cut off in time and an alarm signal can be sent to the controller.

7. The urea hydrolysis reactor according to claim 6, characterized in that: The confluence pipe (107) is further configured to merge the steam introduced by the first steam introduction pipe (106) and the steam introduced by the second steam introduction pipe (108).

8. The urea hydrolysis reactor according to claim 7, characterized in that: The temperature and pressure reduction unit (109) is further configured to dynamically adjust the temperature and pressure of the steam according to the actual operating pressure and temperature in the hydrolysis reactor (101).

9. The urea hydrolysis reactor according to claim 8, characterized in that: The controller is further configured to receive operation data from the hydrolysis reactor (101), and adjust the working state of the temperature reduction and pressure reduction unit (109) based on the operation data.

10. A method for using a urea hydrolysis reactor, characterized in that: A urea hydrolysis reactor comprising any one of claims 1 to 9, and The urea solution is transported to the hydrolysis reactor through the urea solution transport device; The saturated steam supply device provides steam of required temperature and pressure to heat the urea solution in the hydrolysis reactor through the coil structure, but does not come into direct contact with the urea solution; The control system monitors and adjusts the temperature and pressure of the urea solution in the hydrolysis reactor, as well as the hydrolysis reaction rate, to ensure optimal hydrolysis conditions; The heated steam condenses and returns to the steam trap through the reflux mechanism; After being purified by the filter in the drain pump, the condensed water is pumped back into the system for dissolving urea; According to the operating state of the hydrolysis reactor, the controller automatically adjusts the operating state of the temperature reduction and pressure reduction unit 9 to maintain the internal operating state of the hydrolysis reactor.

Images