Urea production plant with low carbon dioxide emission

Abstract

The present disclosure provides a urea production plant with low greenhouse gas emissions, in particular low carbon dioxide emissions. The apparatus includes a first high pressure steam network, a device connected to the first high pressure steam network, and one or more electric boilers configured to generate high pressure steam and deliver the high pressure steam to the first high pressure steam network. The present disclosure also provides a method for producing urea with low greenhouse gas emissions.

Description

Technical Field

[0001] The present disclosure relates to the field of hot urea production. Background Art

[0002] Urea (H 2 NCONH 2 ) is the most commonly used nitrogen-containing fertilizer today. The global annual production is estimated to be about 200 million tons. In addition to being used as a fertilizer, urea is also used in various chemical syntheses and as a solution in diesel-powered vehicles to reduce nitrogen oxide emissions.

[0003] Urea production equipment can use different technologies, such as the Stamicarbon or Saipem processes, but they all rely on the same basic principle. In the synthesis section of urea production equipment, ammonia (NH 3 ) and carbon dioxide (CO 2 ) react at high pressure (above 130 bar) and high temperature to produce an aqueous solution containing urea, ammonium carbamate ([NH 4 [H 2 NCO 2 ) and free ammonia. Then the aqueous solution is purified and concentrated to obtain a urea melt. The urea melt can be diluted to obtain an aqueous urea solution (such as diesel exhaust fluid) that can be used in a selective catalytic or non-catalytic reduction system, mixed with other nutrient sources (such as ammonium nitrate) to obtain an aqueous urea ammonium nitrate solution, or solidified into a urea-containing solid (such as granules or pellets).

[0004] The production of urea requires a large amount of energy input, especially due to the reaction equilibrium between the starting materials and the final product. In most urea plants, this energy is obtained by burning non-renewable energy sources (such as natural gas or oil) to heat water and produce steam. However, this energy production releases a large amount of carbon dioxide (a greenhouse gas) into the atmosphere, and authorities and customers are constantly demanding a reduction in carbon dioxide emissions in urea production. Summary of the Invention

[0005] Currently, a new method for reducing carbon dioxide emissions in urea plants has been identified, and a urea plant with reduced carbon dioxide emissions has been designed.

[0006] It has been found that in urea production equipment, the boilers that generate the high-pressure steam required for urea production equipment are one of the most important sources of greenhouse gas emissions (especially CO 2 ). These boilers typically use fossil fuels (such as natural gas) to heat water and produce steam. Replacing these boilers with electric boilers, thereby consuming electricity to generate heat, is equivalent to significantly reducing the CO 2 emissions of the equipment.

[0007] In a first aspect, the present disclosure provides a urea production apparatus, the urea production apparatus including a first high-pressure steam network, a device connected to the first high-pressure steam network, and one or more electric boilers configured to generate high-pressure steam and deliver the high-pressure steam to the first high-pressure steam network.

[0008] In another aspect, the present disclosure provides a method for producing a urea melt in a urea production apparatus as described in the previous disclosure, wherein the urea production apparatus includes a first high-pressure steam network, a device connected to the first high-pressure steam network, and one or more electric boilers, and the method includes the following steps:

[0009] a) generating high-pressure steam using one or more electric boilers;

[0010] b) directing the high-pressure steam generated in step a) to the first high-pressure steam network;

[0011] c) mixing carbon dioxide and ammonia in a reactor, thereby producing a synthesis solution containing water, urea, ammonium carbamate, and free ammonia;

[0012] d) supplying the high-pressure steam from the first high-pressure steam network and the synthesis solution generated in step c) to a high-pressure stripper, thereby producing an aqueous solution containing urea and depleted of ammonium carbamate and free ammonia;

[0013] e) treating the aqueous solution obtained in step d) to obtain a urea melt. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The following description of the drawings of specific embodiments of the system according to the present disclosure is given by way of example only and is not intended to limit this description, its application, or use. In the drawings, like reference numerals refer to like or similar parts and features.

[0015] Figure 1 Represents the synthesis section of an embodiment of a urea production apparatus according to the present disclosure.

[0016] Figure 2 Represents the synthesis section of another embodiment of a urea production apparatus according to the present disclosure.

[0017] Figure 3 Represents the synthesis section of another embodiment of a urea production apparatus according to the present disclosure.

[0018] Figure 4 Represents the synthesis section of another embodiment of a urea production apparatus according to the present disclosure.

[0019] Figure 5 Represents a section of another embodiment of a urea production apparatus according to the present disclosure. Detailed implementation manners

[0020] Unless otherwise defined, all terms used to disclose the present invention, including technical and scientific terms, have the meanings commonly understood by those of ordinary skill in the art to which the present invention pertains. Through further guidance, term definitions are included to better understand the teachings of the present invention.

[0021] All references cited in this specification are hereby incorporated by reference in their entirety.

[0022] As used herein, the following terms have the following meanings:

[0023] Unless the context clearly dictates otherwise, the articles "a", "an", and "the" as used herein refer to both singular and plural referents. For example, "a device" refers to one or more than one device.

[0024] As used herein, "comprising" and its variants and "consisting of" are synonymous with "including" and its variants or "containing" and its variants, and are inclusive or open-ended terms that specify the presence of, for example, the content following the component, and do not exclude or preclude the presence of additional, unenumerated components, features, elements, members, steps known in the art or disclosed therein.

[0025] In a first aspect, the present disclosure provides a urea production device, which includes a first high-pressure steam network, a device connected to the first high-pressure steam network, and one or more electric boilers, and the one or more electric boilers are configured to generate high-pressure steam and deliver the high-pressure steam to the first high-pressure steam network.

[0026] An electric boiler is a device configured to receive water (especially demineralized water) and electricity and generate steam that can be saturated or superheated. The electric boiler can be configured to generate steam at the pressure required by the device.

[0027] In some embodiments, the one or more electric boilers are configured to generate steam at a pressure of 1.0 MPa to 2.5 MPa.

[0028] The one or more electric boilers are connected to the first high-pressure steam network of the urea production device, and the first high-pressure steam network is configured to receive high-pressure steam and is configured to direct the high-pressure steam generated by the electric boiler to the first high-pressure steam network.

[0029] A first high-pressure steam network, hereinafter referred to as the high-pressure (HP) steam network, is connected to the units that require high-pressure steam to operate. In some embodiments, the urea production equipment includes an HP stripper and / or a urea hydrolyzer. In some embodiments, the urea production equipment includes an HP stripper. In some embodiments, the urea production equipment includes a urea hydrolyzer. In some embodiments, the urea production equipment includes an HP stripper and a urea hydrolyzer.

[0030] The HP stripper is a device configured to receive a synthesis solution (which is an aqueous solution containing urea, ammonium carbamate, and free ammonia) from a synthesis reactor and heat the synthesis solution with HP steam so that ammonium carbamate decomposes back into ammonia and carbon dioxide. The gas is separated from the aqueous solution, and an aqueous solution containing urea and depleted of free ammonia and ammonium carbamate is thereby obtained. The aqueous solution produced by the HP stripper may still contain some ammonium carbamate and free ammonia, but in much smaller amounts than those contained in the synthesis solution. The HP stripper also produces a gaseous stream containing ammonia and carbon dioxide.

[0031] The urea hydrolyzer is a device configured to receive an aqueous solution containing urea and heat the solution with HP steam so that the urea contained in the solution hydrolyzes into ammonia and carbon dioxide. The urea hydrolyzer produces an aqueous solution depleted of urea and a gaseous stream containing ammonia and carbon dioxide. The aqueous solution produced by the hydrolyzer can be further processed to remove more ammonia and / or carbon dioxide. In some embodiments, the hydrolyzer is connected to a desorption column configured to remove ammonia and carbon dioxide from the aqueous solution.

[0032] The urea hydrolyzer can also be connected to the low-pressure (LP) section so that the gas stream produced by the hydrolyzer can be reinjected into the process. The gas stream produced by the hydrolyzer can be injected into the LP section as a gas stream, or the gas stream can first be condensed into an aqueous solution and then injected into the LP section. In some embodiments, the urea hydrolyzer is connected to the LP section. In some embodiments, the urea hydrolyzer is connected to a condenser, and the condenser is connected to the LP section.

[0033] In some embodiments, the first high-pressure steam network is configured to receive steam at a pressure of from 1.0 MPa to 11.0 MPa, from 2.0 MPa to 11.0 MPa, from 2.0 MPa to 10.0 MPa, from 2.0 MPa to 9.0 MPa, from 2.0 MPa to 8.0 MPa, from 2.0 MPa to 7.0 MPa, from 2.0 MPa to 6.0 MPa, from 2.0 MPa to 5.0 MPa, from 2.0 MPa to 4.0 MPa, from 2.0 MPa to 3.0 MPa, from 2.0 MPa to 2.9 MPa, from 2.0 MPa to 2.7 MPa, from 2.0 MPa to 2.6 MPa, from 2.0 MPa to 2.5 MPa, from 2.0 MPa to 2.4 MPa, from 1.5 MPa to 2.9 MPa, from 1.5 MPa to 2.7 MPa, from 1.5 MPa to 2.6 MPa, from 1.5 MPa to 2.5 MPa, or from 1.5 MPa to 2.4 MPa, from 1.8 MPa to 2.9 MPa, from 1.8 MPa to 2.7 MPa, from 1.8 MPa to 2.6 MPa, from 1.8 MPa to 2.5 MPa, or from 1.8 MPa to 2.4 MPa. The HP steam network can be configured to receive steam at a pressure specific to the equipment. Urea equipment uses different technologies depending on the company that builds the urea equipment. For example, in Stamicarbon equipment (i.e., equipment built by technology provider Stamicarbon), the HP steam network is configured to receive steam at a pressure of from 1.8 MPa to 2.5 MPa.

[0034] The urea production equipment may further include a second steam network, particularly a second steam network configured to receive low-pressure (LP) steam.

[0035] In some embodiments, the second steam network is configured to receive steam at a pressure of from 0.1 MPa to 0.7 MPa, from 0.2 MPa to 0.7 MPa, from 0.1 MPa to 0.6 MPa, from 0.2 MPa to 0.6 MPa, from 0.3 MPa to 0.6 MPa or from 0.3 MPa to 0.7 MPa. The second LP steam network can be configured to receive steam at a pressure specific to the equipment.

[0036] The urea production equipment includes a plurality of devices that require LP steam to operate. Examples of devices that require LP steam include evaporators, carbamate decomposers, desorbers, and steam injectors.

[0037] The urea production equipment does not require a specific device such as a boiler to produce low-pressure steam from water. Instead, the urea production equipment uses steam generated by some of the devices included in the equipment, particularly its HP carbamate condenser.

[0038] As described above, the urea production equipment includes an HP stripper to remove free ammonia and ammonium carbamate from the synthesis solution. The HP stripper produces two streams: an aqueous solution containing urea with depleted ammonium carbamate and free ammonia, and a gaseous stream containing ammonia, carbon dioxide, and water. The components of the gaseous stream are valuable products, and these components can be recycled back to the synthesis reactor to produce more urea. However, the gaseous stream produced by the HP stripper contains more heat than required by the urea reactor. Therefore, directly reinjecting the gaseous stream from the HP stripper into the reactor would result in energy loss. Instead, the urea production equipment includes a carbamate condenser, also known as a high-pressure (HP) carbamate condenser, which is configured to condense the gaseous stream containing carbon dioxide, ammonia, and water produced by the HP stripper into an aqueous solution containing ammonium carbamate and free ammonia. This aqueous solution can be injected into the reactor by using an ejector, using ammonia as the motive fluid, or by gravity. The energy or heat from the gaseous stream produced by the HP stripper is recovered in the form of steam (especially low-pressure steam) in the HP carbamate condenser, and this steam is directly directed to other devices included in the urea production equipment.

[0039] In some embodiments, the equipment includes an HP carbamate condenser and an ejector, where the carbamate condenser is connected to the HP stripper and connected to the ejector, and the ejector is connected to the HP carbamate condenser and the synthesis reactor.

[0040] In some embodiments, the HP carbamate condenser is directly connected to the synthesis reactor and is configured to produce a two-phase flow (liquid and gas), which can be directly injected into the synthesis reactor without an ejector.

[0041] Condensing the gaseous stream containing water, carbon dioxide, and ammonia is an exothermic operation, and it is possible to recover the heat generated by condensation by producing steam. The carbamate condenser is configured to condense the gaseous stream containing ammonia, carbon dioxide, and water and produce steam. The steam produced by the carbamate condenser is LP steam with a pressure ranging from 0.25 MPa to 7.50 MPa and is directed to the second steam network of the equipment so that this steam can be distributed to devices that require low-pressure steam during operation.

[0042] The urea production equipment includes a synthesis section that includes a synthesis reactor, where ammonia and carbon dioxide are mixed at high pressure and high temperature to form an aqueous solution containing urea and ammonium carbamate.

[0043] The synthesis reactor is connected to the HP stripper so that the synthesis solution produced by the synthesis reactor can be transported to the HP stripper. The HP stripper removes some water, ammonium carbamate, and free ammonia from the synthesis solution to produce a urea solution that still contains some ammonium carbamate and free ammonia but less than the amount contained in the synthesis solution.

[0044] The solution produced by the HP stripper is transported to the medium-pressure section or the low-pressure section. The medium-pressure section and / or the low-pressure section contain various equipment for further purifying and concentrating the solution produced by the HP stripper. In some embodiments, the medium-pressure section and / or the low-pressure section contain any components selected from the group consisting of condensers, liquid-vapor separators, and concentrators.

[0045] The low-pressure section produces a urea solution containing at least 50.0 wt% urea and from 0 to 50.0 wt% water.

[0046] In some embodiments, the low-pressure section of the urea production equipment is configured to produce a urea solution containing from 50.0 wt% to 80.0 wt%, from 60.0 wt% to 80.0 wt%, from 50.0 wt% to 75.0 wt%, from 60.0 wt% to 75.0 wt%, from 65.0 wt% to 80.0 wt%, from 65.0 wt% to 75.0 wt%, or from 65.0 wt% to 70.0 wt% urea. In some embodiments, the low-pressure section of the urea production equipment is configured to produce a urea solution containing from 20.0 wt% to 50.0 wt%, from 20.0 wt% to 40.0 wt%, from 25.0 wt% to 50.0 wt%, from 25.0 wt% to 40.0 wt%, from 20.0 wt% to 35.0 wt%, from 25.0 wt% to 35.0 wt%, or from 30.0 wt% to 35.0 wt% water.

[0047] In some embodiments, the urea production equipment includes a concentration section. The concentration section is configured to receive a urea solution from the low-pressure section of the equipment, which may contain up to 50.0 wt%, up to 40.0 wt%, or up to 30.0 wt% water, and produce a urea melt that may contain at least 95.0 wt% urea.

[0048] The concentration section may include one or more evaporators and one or more liquid-vapor separators.

[0049] In some embodiments, the concentration section is connected to the solidification section of the equipment. The solidification section is configured to produce a solid, particulate composition, such as via granulation or pelletization.

[0050] Alternatively, the urea melt can also be diluted with water to produce a urea solution. This urea solution can be used as diesel exhaust fluid (DEF).

[0051] The urea production equipment may also include multiple loops to handle waste streams generated by some devices, recover ammonia and carbon dioxide from these waste streams, and transport the recovered ammonia and carbon dioxide back to the synthesis section or the medium-pressure or low-pressure section.

[0052] In some embodiments, a urea production apparatus includes a carbon dioxide compressor and an electric motor configured to provide power to the carbon dioxide compressor. Urea synthesis in the reactor is carried out at high pressure (above 10 MPa), so the urea production apparatus includes a carbon dioxide compressor to increase the pressure of the carbon dioxide feed. Such a compressor requires a large amount of power to operate, and the apparatus includes a power source connected to the compressor to provide this power. In a conventional urea production apparatus, the power source is typically a gas turbine or a steam turbine. Such turbines are popular because the feeds, gases, or steam they use are readily available in the apparatus. However, gas turbines or steam turbines generate greenhouse gas emissions (directly for gas turbines or indirectly for steam turbines since steam is typically produced by burning fossil fuels). Therefore, to maintain low greenhouse gas emissions, it is an advantage to use an electric motor to power the carbon dioxide compressor. Such a power source can be considered a low-emission source of greenhouse gases as long as the electricity supplied is generated by a method that does not produce greenhouse gas emissions, such as solar, wind, ocean, or nuclear power plants.

[0053] In some embodiments, the carbon dioxide compressor is connected to a synthesis reactor, and the carbon dioxide stream from the carbon dioxide compressor is configured to be directly injected into the synthesis reactor.

[0054] In some embodiments, the carbon dioxide compressor is connected to an HP stripper and the carbon dioxide stream from the carbon dioxide compressor is configured to be injected into the HP stripper. Carbon dioxide can be used as a stripping gas in the HP stripper to increase the transfer of gas from the aqueous solution to the gas phase. The gaseous stream produced by the HP stripper is finally injected into the synthesis reactor after passing through a carbamate condenser. Thus, the carbon dioxide required for urea synthesis can first be used as a stripping gas and then injected into the synthesis reactor to form urea.

[0055] In some embodiments, the urea production apparatus includes an electric motor configured to provide power to an ammonia pump. Ammonia is directed to the reactor at high pressure through one or more ammonia pumps. These pumps also require a power source to operate, and the electric motor ensures that this step does not cause greenhouse gas emissions.

[0056] In some embodiments, the ammonia pump is connected to an injector configured to inject an aqueous solution into the synthesis reactor. Instead of injecting ammonia alone into the synthesis reactor, it may be more advantageous to direct the ammonia stream to an injector configured to inject an aqueous solution (especially an aqueous solution produced by an HP carbamate decomposer) into the synthesis reactor. The injector can use the ammonia stream as a motive fluid. In such an embodiment, the apparatus does not require another gas pump to inject the aqueous solution into the synthesis reactor.

[0057] In some embodiments, all pumps included in the urea production equipment are driven by electric motors. This ensures that the greenhouse gas emissions of the equipment are kept as low as possible.

[0058] In some embodiments, the urea production equipment does not include a direct source of greenhouse gas emissions.

[0059] On the other hand, the present disclosure provides a method for producing a urea melt in a urea production equipment as described in the previous disclosure, wherein the urea production equipment includes a first high-pressure steam network, a device connected to the first high-pressure steam network, and one or more electric boilers, and the method includes the following steps:

[0060] a) Generating high-pressure steam using one or more electric boilers;

[0061] b) Directing the high-pressure steam generated in step a) to the first high-pressure steam network;

[0062] c) Mixing carbon dioxide and ammonia in a reactor, thereby producing a synthesis solution containing water, urea, ammonium carbamate, and free ammonia;

[0063] d) Supplying the high-pressure steam from the first high-pressure steam network and the synthesis solution produced in step c) to a high-pressure stripper, thereby producing an aqueous solution containing urea and depleted of ammonium carbamate and free ammonia;

[0064] e) Treating the aqueous solution obtained in step d) to obtain a urea melt.

[0065] In some embodiments, the urea melt produced in step e) contains at least 95 wt% urea.

[0066] Figure 1 Represents the synthesis section of an embodiment of a urea production equipment according to the present disclosure. The equipment includes a boiling section 1, which includes one or more electric boilers according to its steam demand. The boilers are configured to produce high-pressure steam with a pressure higher than 2.0 MPa or from 2.0 MPa to 2.6 MPa. The boiling section is connected to the HP stripper 2 of the urea production equipment via a first high-pressure steam network. The stripper 2 is connected to a synthesis reactor 3 and is configured to receive a synthesis solution: an aqueous solution containing urea, ammonium carbamate, and free ammonia; and to remove all or part of the ammonium carbamate and free ammonia contained in the synthesis solution. The synthesis reactor 3 is connected to a carbon dioxide compressor 4, which is configured to provide a gaseous carbon dioxide stream at high pressure (e.g., from 130 bar to 200 bar). The synthesis reactor 3 is also connected to an ammonia pump 5, which is configured to supply ammonia to the synthesis reactor 3.

[0067] Figure 2 Represents the synthesis section of another embodiment of a urea production equipment according to the present disclosure. As compared withFigure 1 is similar to the urea production equipment, which includes a boiling section 1. The boiling section includes one or more electric boilers configured to generate high-pressure steam and deliver the steam to the HP stripper 2. The equipment also includes a synthesis reactor 3, a carbon dioxide compressor 4, and an ammonia pump 5. In addition, the equipment includes an HP carbamate condenser 7 and an ejector 6. The HP carbamate condenser 7 is configured to receive a gaseous stream containing ammonia, carbon dioxide, and water from the HP stripper and condense the gaseous stream into an aqueous solution containing ammonium carbamate. The ejector 6 is connected to the HP carbamate condenser 7 and the ammonia pump 5 and is configured to inject the aqueous solution from the HP carbamate condenser 7 into the synthesis reactor 3 using ammonia from the pump 5 as the motive fluid. The HP stripper 2 is configured to produce an aqueous solution containing urea, ammonium carbamate, and free ammonia and is connected to a medium-pressure or low-pressure section configured to purify and concentrate the aqueous solution produced by the HP stripper 2.

[0068] Figure 3 represents the synthesis section of another embodiment of the urea production equipment according to the present disclosure. Similar to Figure 2 the urea production equipment, the urea production equipment includes: a boiling section 1, which includes one or more electric boilers configured to generate high-pressure steam and deliver the steam to the HP stripper 2; a synthesis reactor 3; a carbon dioxide compressor 4; an ammonia pump 5, an HP carbamate condenser 7; and an ejector 6. In this embodiment, the carbon dioxide compressor 4 is connected to the HP stripper 2 such that the carbon dioxide provided by the carbon dioxide compressor 4 is used as the stripping gas in the HP stripper 2. During operation, the carbon dioxide from the carbon dioxide compressor 4 is directed together with the stripped gas, carbon dioxide, ammonia, and water to the HP carbamate condenser 7, where an aqueous solution of ammonium carbamate is formed. As Figure 2 shown, the equipment includes an ejector 6 configured to receive the aqueous solution of ammonium carbamate from the HP carbamate condenser 7 and inject the aqueous solution into the synthesis reactor 3 using ammonia provided by the ammonia pump 5 as the motive fluid.

[0069] Figure 4 represents the synthesis section of another embodiment of the urea production equipment according to the present disclosure. Similar to Figure 1is similar to the urea production equipment, which includes a boiling section 1 configured to generate high-pressure steam and transport the steam to the HP stripper 2 via a first high-pressure steam network. The equipment also includes a synthesis reactor 3, a carbon dioxide compressor 4, and an ammonia pump 5. In addition, the equipment includes two electric motors 11 and 12. The first electric motor 11 is connected to the carbon dioxide compressor 4 and is configured to provide power to the compressor 4. The second electric motor 12 is connected to the ammonia pump 5 and is configured to provide power to the pump 5.

[0070] Figure 5 represents a section of another embodiment of the urea production equipment according to the present disclosure. The urea production equipment includes a boiling section 1 configured to generate high-pressure steam and transport the steam to the HP stripper 2 via a first high-pressure steam network. The equipment also includes a synthesis reactor 3, a carbon dioxide compressor 4, and an ammonia pump 5. The equipment further includes a low-pressure and / or medium-pressure section 8 connected to the HP stripper 2 and configured to receive an aqueous composition containing urea, ammonium carbamate, and free ammonia. The low-pressure and / or medium-pressure section 8 is connected to a concentration section 10 configured to convert the aqueous solution from the low-pressure and / or medium-pressure section 8 into a urea melt. The concentration section 10 includes an evaporator that produces an aqueous solution containing a small amount of urea. The equipment includes a hydrolyzer 9 configured to receive the aqueous solution from the concentration section 10 and remove urea therefrom. The hydrolyzer 9 performs its task by decomposing urea back into ammonia and carbon dioxide by heating the aqueous solution. The hydrolyzer 9 is connected to the boiling section 1 and is configured to receive high-pressure steam from the operating boiling section 1. The hydrolyzer 9 is also connected to the low-pressure and / or medium-pressure section 8 such that the gaseous stream generated by the hydrolyzer 9 can be directly reintroduced into the production process as a gas stream or can first pass through a condenser to be converted into an aqueous solution, which is then injected into the low-pressure and / or medium-pressure section 8.

Claims

1. A urea production device, which includes a first high-pressure steam network and a device connected to the first high-pressure steam network, characterized in that the urea production device further includes one or more electric boilers, and the one or more electric boilers are configured to generate high-pressure steam and deliver the high-pressure steam to the first high-pressure steam network.

2. The urea production device according to claim 1, wherein the one or more electric boilers are configured to generate steam with a pressure of 1.0 MPa to 2.5 MPa.

3. The urea production device according to claim 1 or 2, wherein the first high-pressure steam network is configured to receive steam with a pressure ranging from 1.0 MPa to 2.5 MPa.

4. The urea production device according to any one of claims 1 to 3, wherein the device connected to the first high-pressure steam network is a high-pressure stripper or a urea hydrolyzer.

5. The urea production device according to any one of claims 1 to 4, wherein the urea production device includes a high-pressure stripper and a urea hydrolyzer.

6. The urea production device according to any one of claims 1 to 5, wherein the urea production device includes a second low-pressure steam network, and the second low-pressure steam network is configured to receive steam with a pressure ranging from 0.1 MPa to 0.7 MPa.

7. The urea production device according to any one of claims 1 to 6, which further includes a device selected from the group consisting of a condenser, a liquid-vapor separator, a carbamate decomposer, and a concentrator.

8. The urea production device according to any one of claims 1 to 7, wherein the urea production device includes a carbon dioxide compressor and an electric motor, and the electric motor is configured to provide power to the carbon dioxide compressor.

9. The urea production device according to any one of claims 1 to 8, wherein the urea production device includes an ammonia pump and an electric motor, and the electric motor is configured to provide power to the ammonia pump.

10. The urea production device according to any one of claims 1 to 9, which further includes a device selected from the group consisting of a synthesis reactor and a high-pressure carbamate condenser.

11. The urea production device according to any one of claims 1 to 10, wherein the device includes one or more pumps, and the one or more pumps are driven by an electric motor.

12. The urea production device according to any one of claims 1 to 11, which further includes a process selected from the group consisting of a synthesis process, a medium-pressure process, a low-pressure process, a concentration process, and a solidification process.

13. A method for producing a urea melt in the urea production device according to any one of claims 1 to 12, wherein the urea production device includes a first high-pressure steam network, a device connected to the first high-pressure steam network, and one or more electric boilers, the method comprises the following steps: a) generating high-pressure steam using the one or more electric boilers; b) guiding the high-pressure steam generated in step a) to the first high-pressure steam network; c) Mix carbon dioxide and ammonia in a reactor, thereby producing a synthesis solution containing water, urea, ammonium carbamate and free ammonia; d) Feed high-pressure steam from the first high-pressure steam network and the synthesis solution produced in step c) to a high-pressure stripper, thereby producing an aqueous solution containing urea and depleted of ammonium carbamate and free ammonia; e) Treat the aqueous solution obtained in step d) to obtain a urea melt.

14. The method according to claim 13, wherein the urea melt produced in step e) contains at least 95.0% by weight of urea.

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