System for optimizing and efficiently utilizing steam

Abstract

The invention discloses an optimized and efficient steam utilization system, which belongs to the technical field of efficient steam utilization and comprises a 9.8 MPa steam treatment device, a 4.3 MPa steam treatment device, a 3.8 MPa steam treatment device, a 2.5 MPa steam treatment device, a 1.5 MPa steam treatment device and a 0.5 MPa steam treatment device. According to the steam optimization and efficient utilization system, steam cascade power generation and external supply are combined, and efficient recycling of steam potential energy and heat energy is achieved; by optimizing the pipe network structure and adopting the modes of superheated steam supplement, waste heat steam pressure increasing and the like, the direct pressure reduction loss is reduced, the consumption of high-pressure steam is remarkably reduced, high-load stable operation of a single boiler becomes possible, and the efficiency of the boiler is improved; meanwhile, by separately arranging an overheating steam pipe network and a saturated steam pipe network, precise external supply of byproduct steam is achieved, and the comprehensive utilization efficiency of energy is further improved.

Description

Technical Field

[0001] This invention relates to the field of steam efficiency utilization technology, and in particular to a system for optimizing and maximizing steam utilization. Background Technology

[0002] The steam quality required by enterprises in an industrial park varies greatly depending on their respective production facilities. For example, the steam pipeline network in an industrial park that supplies steam to a synthetic ammonia plant typically uses a single main steam pipe with branch desuperheating and pressure reduction. The steam from the main pipe must be transported according to the highest quality requirements, usually by depressurizing 3.8MPa superheated steam before being sent out. Directly using 3.8MPa steam for depressurization would result in a loss and waste of steam energy. The externally transported steam mainly comes from boiler steam, which is also costly and affects the economic benefits of enterprises.

[0003] In ammonia synthesis plants, varying degrees of desuperheating and pressure reduction exist within the steam network at different levels to maintain overall network balance. During the decompression process from high to low pressure, pressure and enthalpy drops occur. While adding desuperheating water can offset some energy loss, a portion of energy remains inefficiently utilized, resulting in wasted steam decompression potential and thermal energy. The 0.5MPa low-pressure steam produced as a byproduct of ammonia synthesis plants is typically abundant. This excess 0.5MPa steam is primarily used to drive steam-driven pumps or generator sets, indicating low utilization efficiency. Furthermore, boiler load directly impacts boiler thermal efficiency and overall energy consumption. Ensuring efficient boiler operation under high loads hinges on the balance and optimized adjustment of the steam network, a problem that urgently needs to be addressed. Summary of the Invention

[0004] The purpose of this invention is to provide a system for optimizing and efficiently utilizing steam. By combining steam cascade power generation with external supply, the system achieves efficient recovery and utilization of steam potential energy and thermal energy. By optimizing the pipeline structure and using methods such as superheated steam supplementation and waste heat steam pressurization, the system reduces direct pressure reduction losses, significantly lowers high-pressure steam consumption, and makes it possible for a single boiler to operate stably under high load, thereby improving boiler efficiency. At the same time, by separating the superheated and saturated steam pipelines and achieving precise external supply of by-product steam, the system further improves the overall energy utilization efficiency.

[0005] To achieve the above objectives, the present invention provides a system for optimizing and efficiently utilizing steam, comprising a 9.8MPa steam treatment device, a 4.3MPa steam treatment device, a 3.8MPa steam treatment device, a 2.5MPa steam treatment device, a 1.5MPa steam treatment device, and a 0.5MPa steam treatment device. The 9.8MPa steam treatment device is connected to the 2.5MPa and 3.8MPa steam treatment devices, respectively. The 3.8MPa steam treatment device is connected to the 4.3MPa and 2.5MPa steam treatment devices, respectively. The 2.5MPa steam treatment device is connected to the 1.5MPa, 0.5MPa, and 4.3MPa steam treatment devices, respectively. The 1.5MPa steam treatment device is connected to the 0.5MPa steam treatment device.

[0006] Preferably, the 9.8MPa steam treatment unit includes a No. 1 boiler, a No. 2 boiler, a 9.8MPa superheated steam pipeline network, an air separation unit, a first desuperheater and pressure reducer, a 9.8MPa steam turbine generator, and a first steam turbine. The No. 1 boiler, the No. 2 boiler, the air separation unit, the first desuperheater and pressure reducer, and the first steam turbine are all connected to the 9.8MPa superheated steam pipeline network. The 9.8MPa superheated steam pipeline network is connected to the 3.8MPa steam treatment unit through the first desuperheater and pressure reducer. The first steam turbine is connected to both the 9.8MPa steam turbine generator and the 2.5MPa steam treatment unit.

[0007] Preferably, the 4.3MPa steam treatment device includes a 4.3MPa steam drum, a steam heater, a 4.3MPa steam turbine generator, and a second steam turbine. The 4.3MPa steam drum is connected to both the steam heater and the second steam turbine. The second steam turbine is connected to both the 4.3MPa steam turbine generator and the 2.5MPa steam treatment device. The steam heater is connected to the 3.8MPa steam treatment device.

[0008] Preferably, the 3.8MPa steam treatment unit includes a 3.8MPa superheated steam pipeline network, a park superheated steam pipeline network, a third steam turbine, an ice machine, a sulfur recovery by-product unit, an ammonia synthesis by-product unit, a fourth steam turbine, a syngas compressor, a fifth steam turbine, a CO2 compressor, a low-pressure superheated steam desuperheater and pressure reducer, a high-pressure superheated steam desuperheater and pressure reducer, and a second desuperheater and pressure reducer. The 3.8MPa superheated steam pipeline network is connected to the park superheated steam pipeline network, the third steam turbine, the sulfur recovery by-product unit, the ammonia synthesis by-product unit, the fourth steam turbine, the fifth steam turbine, the first desuperheater and pressure reducer, and the second desuperheater and pressure reducer. The third steam turbine is connected to the ice machine, the fourth steam turbine is connected to the syngas compressor, and the fifth steam turbine is connected to the CO2 compressor. The park superheated steam pipeline network is connected to the low-pressure superheated steam desuperheater and pressure reducer and the high-pressure superheated steam desuperheater and pressure reducer, respectively. The second desuperheater and pressure reducer is connected to the 2.5MPa steam treatment unit.

[0009] Preferably, a 4.3MPa steam pressure reducing valve is installed between the 3.8MPa superheated steam pipeline and the steam heater, and a 3.8MPa external supply pressure reducing valve is installed between the 3.8MPa superheated steam pipeline and the superheated steam pipeline of the park.

[0010] Preferably, the 2.5MPa steam treatment device includes a 2.5MPa saturated steam pipeline network, a 2.5MPa steam drum for conversion, a urea system, and a third desuperheating and pressure reducing device. The 2.5MPa saturated steam pipeline network is connected to the second desuperheating and pressure reducing device, the second steam turbine, the 2.5MPa steam drum for conversion, the urea system, and the third desuperheating and pressure reducing device.

[0011] Preferably, the first steam turbine is connected to both the 2.5MPa saturated steam network and the superheated steam network of the industrial park, and a 9.8MPa steam turbine shut-off valve is provided between the first steam turbine and the superheated steam network of the industrial park.

[0012] Preferably, the 1.5MPa steam treatment device includes a 1.5MPa saturated steam pipeline network in the industrial park, a fourth desuperheater and pressure reducer, a steam compressor, and a 1.5MPa waste boiler for conversion and synthesis. The steam compressor is connected to the 2.5MPa saturated steam pipeline network and the 1.5MPa waste boiler for conversion and synthesis, respectively. The 1.5MPa waste boiler for conversion and synthesis is connected to the 1.5MPa saturated steam pipeline network in the industrial park and the 0.5MPa steam treatment device, respectively. The 1.5MPa saturated steam pipeline network in the industrial park is connected to the fourth desuperheater and pressure reducer.

[0013] Preferably, the 0.5MPa steam treatment device includes a first 0.5MPa saturated steam pipeline network, a 0.5MPa waste boiler, a stripping tower, a process deaeration mechanism, a 0.5MPa steam turbine engine, a sixth steam turbine, a circulating water pump, and a second 0.5MPa saturated steam pipeline network. The first 0.5MPa saturated steam pipeline network is connected to the 0.5MPa waste boiler, the stripping tower, the process deaeration mechanism, and the sixth steam turbine, respectively. The sixth steam turbine is connected to the 0.5MPa steam turbine engine and the circulating water pump, respectively.

[0014] Preferably, a 1.5MPa minus 0.5MPa pressure reducing valve is provided between the second 0.5MPa saturated steam pipeline and the conversion and synthesis 1.5MPa waste boiler, and the second 0.5MPa saturated steam pipeline is also connected to a third desuperheating and pressure reducing device.

[0015] Therefore, the steam optimization and efficient utilization system described above has the following beneficial effects: (1) The steam produced by No. 1 and No. 2 boilers is reduced to 2.5 MPa after being generated by a 9.8 MPa steam turbine generator. The steam temperature is still very high. The thermal energy of this part of the steam is fully utilized. The external steam supply is changed from 3.8 MPa steam pressure reduction and external delivery to 9.8 MPa steam turbine generator power generation and external delivery. By generating electricity first and then supplying it to enterprises in the park, the steam energy is fully utilized. In addition, the steam produced by the 4.3 MPa steam drum is changed to 2.5 MPa steam after being generated by a 4.3 MPa steam turbine generator. The steam potential energy is fully utilized, and the comprehensive utilization of energy is achieved. (2) On the one hand, the saturated steam from the 4.3MPa steam drum is converted into superheated steam by the steam superheater and fed into the 3.8MPa superheated steam pipeline. On the other hand, the saturated steam produced by the 1.5MPa waste boiler is pressurized by the steam compressor and fed into the 2.5MPa saturated steam pipeline. The amount of direct pressure-reduced steam is minimized. By optimizing the use of steam in each level of the steam pipeline, the amount of 9.8MPa high-pressure steam used is reduced. Thus, only one boiler needs to be put into operation to meet the production needs. Moreover, the boiler operates under high load, which improves the boiler efficiency. (3) According to the needs of different users, the steam sent to the park makes full use of the steam produced by the ammonia synthesis by-product unit. The original high temperature and high pressure steam was gradually depressurized and deheated, and the superheated steam network and saturated steam network were set up separately. The by-product 1.5MPa and 0.5MPa steam were sent out separately, which improved the steam utilization efficiency. (4) The steam optimization and efficient utilization system and application of the present invention are reasonably designed, simple in structure, safe and reliable, and easy to use, and have great value for promotion and use.

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0017] Figure 1 This is a structural flowchart of a system embodiment 1 for optimizing and efficiently utilizing steam according to the present invention.

[0018] Figure Labels 1. Boiler No. 1; 2. Boiler No. 2; 3. 9.8MPa superheated steam pipeline; 4. Air separation unit; 5. First desuperheater and pressure reducer; 6. 9.8MPa steam turbine generator; 7. First steam turbine; 8. Ammonia synthesis by-product unit; 9. Sulfur recovery by-product unit; 10. 4.3MPa steam drum; 11. Steam heater; 12. 4.3MPa steam turbine generator; 13. Second steam turbine; 14. 3.8MPa superheated steam pipeline; 15. Industrial park superheated steam pipeline; 16. Third steam turbine; 17. Ice machine; 18. Fourth steam turbine; 19. Syngas compressor; 20. Fifth steam turbine; 21. CO2 compressor; 22. Low-pressure superheated steam desuperheater and pressure reducer; 23. High-pressure superheated steam desuperheater and pressure reducer; 24. 4.3MPa steam pressure reducing valve; 25. 3. 8MPa external supply pressure reducing valve; 26, 2.5MPa saturated steam pipeline; 27, 2.5MPa steam drum for conversion; 28, urea system; 29, third desuperheater and pressure reducer; 30, 9.8MPa turbine shut-off valve; 31, 1.5MPa saturated steam pipeline for the industrial park; 32, fourth desuperheater and pressure reducer; 33, steam compressor; 34, 1.5MPa waste boiler for conversion and synthesis; 35, second 0.5MPa saturated steam pipeline; 36, 0.5MPa waste boiler for conversion; 37, conversion stripping tower; 38, process deaeration system; 39, 0.5MPa turbine engine; 40, sixth turbine; 41, circulating water pump; 42, 1.5MPa to 0.5MPa pressure reducing valve; 43, second desuperheater and pressure reducer; 44, first 0.5MPa saturated steam pipeline. Detailed Implementation

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] Example 1 like Figure 1As shown, the present invention provides a system for optimizing and efficiently utilizing steam, including a 9.8MPa steam treatment device, a 4.3MPa steam treatment device, a 3.8MPa steam treatment device, a 2.5MPa steam treatment device, a 1.5MPa steam treatment device, and a 0.5MPa steam treatment device. The 9.8MPa steam treatment device is connected to the 2.5MPa and 3.8MPa steam treatment devices, the 3.8MPa steam treatment device is connected to the 4.3MPa and 2.5MPa steam treatment devices, the 2.5MPa steam treatment device is connected to the 1.5MPa, 0.5MPa, and 4.3MPa steam treatment devices, and the 1.5MPa steam treatment device is connected to the 0.5MPa steam treatment device.

[0022] The 9.8MPa steam treatment unit provides 9.8MPa superheated steam for power generation, with surplus steam depressurized and supplied to the downstream pipeline network; the 4.3MPa steam treatment unit collects 4.3MPa saturated steam generated in the conversion section, which is then heated or depressurized to 3.8MPa or 2.5MPa for power generation, achieving energy cascade utilization; the 3.8MPa steam treatment unit collects by-product steam from the synthesis system and external steam for use by large compressor turbines, and supplies superheated steam to the industrial park; the 2.5MPa steam treatment unit receives... Saturated steam from upstream power generation or by-products is mainly used by the urea plant and can also be transported to lower-level pipeline networks. The 1.5MPa steam treatment unit collects low-pressure steam generated by the waste heat boiler, pressurizes it through steam compressor 33 and sends it to the 2.5MPa saturated steam pipeline network 26, or directly supplies it to 1.5MPa users in the park, realizing waste heat recovery. The 0.5MPa steam treatment unit is used to collect the lowest pressure waste heat steam for process heating, deoxygenation, stripping, etc., and the surplus is used for power generation or to drive the circulating water pump 41, realizing the complete utilization of energy.

[0023] The 9.8MPa steam treatment unit includes Boiler 1, Boiler 2, 9.8MPa superheated steam pipeline network 3, air separation unit 4, first desuperheater and pressure reducer 5, 9.8MPa steam turbine generator 6, and first steam turbine 7. Boiler 1, Boiler 2, Air separation unit 4, first desuperheater and pressure reducer 5, and first steam turbine 7 are all connected to the 9.8MPa superheated steam pipeline network 3. The 9.8MPa superheated steam pipeline network 3 is connected to the 3.8MPa steam treatment unit through the first desuperheater and pressure reducer 5. The first steam turbine 7 is connected to the 9.8MPa steam turbine generator 6 and the 2.5MPa steam treatment unit.

[0024] Boiler No. 1 and Boiler No. 2 are used to generate 9.8MPa superheated steam as the main gas source for the system; 9.8MPa superheated steam pipeline 3 is used to collect and transport high-pressure superheated steam to various users; air separation unit 4 is driven by high-pressure steam to supply gas for the main processes; first steam turbine 7 and 9.8MPa steam turbine generator 6 are used to generate electricity using high-pressure steam to achieve high-grade energy conversion; first desuperheater and pressure reducer 5 is a 9.8MPa to 3.8MPa desuperheater and pressure reducer, used to reduce the pressure and temperature of 9.8MPa steam before sending it to 3.8MPa superheated steam pipeline 14 as a supplementary gas source; 9.8MPa steam turbine shut-off valve 30 is used to control whether the steam after power generation is sent to the park's superheated steam pipeline 15.

[0025] The 4.3MPa steam treatment unit includes a 4.3MPa steam drum 10, a steam heater 11, a 4.3MPa steam turbine generator 12, and a second steam turbine 13. The 4.3MPa steam drum 10 is connected to the steam heater 11 and the second steam turbine 13. The second steam turbine 13 is connected to the 4.3MPa steam turbine generator 12 and the 2.5MPa steam treatment unit. The steam heater 11 is connected to the 3.8MPa steam treatment unit.

[0026] The 4.3MPa steam drum 10 is used to collect the 4.3MPa saturated steam generated by the conversion section; the steam heater 11 is used to heat the 4.3MPa saturated steam into superheated steam to improve its quality; the 4.3MPa steam turbine generator 12 and the second steam turbine 13 are used to generate electricity using the 4.3MPa saturated steam, and the residual steam is depressurized to 2.5MPa; the 4.3MPa steam pressure reducing valve 24 is used to reduce the pressure of the 4.3MPa superheated steam to 3.8MPa superheated steam pipeline 14.

[0027] The 3.8MPa steam treatment unit includes a 3.8MPa superheated steam pipeline network 14, a park superheated steam pipeline network 15, a third steam turbine 16, an ice machine 17, a sulfur recovery by-product unit 9, an ammonia synthesis by-product unit 8, a fourth steam turbine 18, a syngas compressor 19, a fifth steam turbine 20, a CO2 compressor 21, a low-pressure superheated steam desuperheater and pressure reducer 22, a high-pressure superheated steam desuperheater and pressure reducer 23, and a second desuperheater and pressure reducer 43. The 3.8MPa superheated steam pipeline network 14 is connected to the park superheated steam pipeline network 15, the third steam turbine 16, the sulfur recovery by-product unit 9, an ammonia synthesis by-product unit 8, a fourth steam turbine 18, a syngas compressor 19, a fifth steam turbine 10, a CO2 compressor 21, a low-pressure superheated steam desuperheater and pressure reducer 22, a high-pressure superheated steam desuperheater and pressure reducer 23, and a second desuperheater and pressure reducer 43. The waste recovery unit 9, the ammonia synthesis waste unit 8, the fourth steam turbine 18, the fifth steam turbine 20, the first desuperheater and pressure reducer 5, and the second desuperheater and pressure reducer 43 are connected. The third steam turbine 16 is connected to the ice machine 17. The fourth steam turbine 18 is connected to the synthesis gas compressor 19. The fifth steam turbine 20 is connected to the CO2 compressor 21. The superheated steam pipeline network 15 in the park is connected to the low-pressure superheated steam desuperheater and pressure reducer 22 and the high-pressure superheated steam desuperheater and pressure reducer 23 respectively. The second desuperheater and pressure reducer 43 is connected to the 2.5MPa steam treatment device.

[0028] A 4.3MPa steam pressure reducing valve 24 is installed between the 3.8MPa superheated steam pipeline 14 and the steam heater 11, and a 3.8MPa external supply pressure reducing valve 25 is installed between the 3.8MPa superheated steam pipeline 14 and the park superheated steam pipeline 15.

[0029] The 3.8MPa superheated steam pipeline 14 is used to collect steam from the ammonia synthesis by-product unit 8 and the sulfur recovery by-product unit 9, as well as external supplementary steam, for use by multiple compressors; the third turbine 16 is used to drive the ice machine 17, the fourth turbine 18 is used to drive the synthesis gas compressor 19, and the fifth turbine 20 is used to drive the CO2 compressor 21; the 3.8MPa external supply park pressure reducing valve 25 is used to control the steam supply pressure to the park superheated steam pipeline 15; the second desuperheating and pressure reducing device 43 is a 3.8MPa to 2.5MPa desuperheating and pressure reducing device, used to reduce the pressure of excess 3.8MPa steam to 2.5MPa saturated steam pipeline 26; the high-pressure superheated steam desuperheating and pressure reducing device 23 and the low-pressure superheated steam desuperheating and pressure reducing device 22 are used to adjust the superheated steam in the park to the parameters required by the user.

[0030] The 2.5MPa steam treatment unit includes a 2.5MPa saturated steam pipeline network 26, a 2.5MPa steam drum 27, a urea system 28, and a third desuperheater and pressure reducer 29. The 2.5MPa saturated steam pipeline network 26 is connected to the second desuperheater and pressure reducer 43, the second steam turbine 13, the 2.5MPa steam drum 27, the urea system 28, and the third desuperheater and pressure reducer 29, respectively.

[0031] The 2.5MPa saturated steam network 26 is used to receive steam from multiple sources, mainly supplying steam to the urea unit 28; the 2.5MPa steam drum 27 is used to provide saturated steam as a by-product of the conversion section; the urea unit 28 is used to use 2.5MPa saturated steam as a process heat source; the third desuperheater and pressure reducer 29 is a 2.5MPa to 0.5MPa desuperheater and pressure reducer, used to reduce the pressure of excess 2.5MPa steam to the second 0.5MPa saturated steam network 35; The first steam turbine 7 is connected to the 2.5MPa saturated steam pipeline 26 and the superheated steam pipeline 15 of the park, respectively. A 9.8MPa steam turbine shut-off valve 30 is provided between the first steam turbine 7 and the superheated steam pipeline 15 of the park.

[0032] The 1.5MPa steam treatment unit includes a 1.5MPa saturated steam pipeline network 31 in the industrial park, a fourth desuperheater and pressure reducer 32, a steam compressor 33, and a 1.5MPa waste boiler for conversion and synthesis 34. The steam compressor 33 is connected to the 2.5MPa saturated steam pipeline network 26 and the 1.5MPa waste boiler for conversion and synthesis 34. The 1.5MPa waste boiler for conversion and synthesis 34 is connected to the 1.5MPa saturated steam pipeline network 31 in the industrial park and the 0.5MPa steam treatment unit. The 1.5MPa saturated steam pipeline network 31 in the industrial park is connected to the fourth desuperheater and pressure reducer 32.

[0033] The 1.5MPa saturated steam pipeline network 31 in the park is used to directly supply medium and low pressure steam to users in the park; the fourth desuperheating and pressure reducing device 32 is a 1.5MPa desuperheating and pressure reducing device used to adjust the steam supply parameters of the park; the steam compressor 33 is used to boost the pressure of 1.5MPa steam to 2.5MPa to supplement the insufficient medium pressure steam; the conversion and synthesis 1.5MPa waste boiler 34 is used to recover the 1.5MPa saturated steam generated by process waste heat.

[0034] The 0.5MPa steam treatment unit includes a first 0.5MPa saturated steam pipeline network 44, a 0.5MPa waste heat exchanger 36, a stripping tower 37, a process deaeration mechanism 38, a 0.5MPa steam turbine engine 39, a sixth steam turbine 40, a circulating water pump 41, and a second 0.5MPa saturated steam pipeline network 35. The first 0.5MPa saturated steam pipeline network 44 is connected to the 0.5MPa waste heat exchanger 36, the stripping tower 37, the process deaeration mechanism 38, and the sixth steam turbine 40, respectively. The sixth steam turbine 40 is connected to the 0.5MPa steam turbine engine 39 and the circulating water pump 41, respectively.

[0035] The first 0.5MPa saturated steam pipeline 44 is used to collect low-pressure steam for process and power generation; the 0.5MPa waste heat boiler 36 is used to recover low-pressure waste heat and generate 0.5MPa saturated steam; the shift stripping tower 37 and the process deaerator 38 use low-pressure steam for process heating; the 0.5MPa steam turbine engine 39 and the sixth steam turbine 40 use low-pressure steam to generate electricity or drive the circulating water pump 41; the second 0.5MPa saturated steam pipeline 35 is used to supply steam to low-pressure users in the park.

[0036] A 1.5MPa to 0.5MPa pressure reducing valve 42 is provided between the second 0.5MPa saturated steam pipeline 35 and the conversion and synthesis 1.5MPa waste boiler 34. The second 0.5MPa saturated steam pipeline 35 is also connected to the third desuperheating and pressure reducing device 29.

[0037] The 1.5MPa to 0.5MPa pressure reducing valve 42 is used to reduce the pressure of 1.5MPa steam to the second 0.5MPa saturated steam network 35, so as to realize the cascade utilization.

[0038] When using the steam optimization and high-efficiency utilization system proposed in this invention, the specific operation is as follows: During normal production, the steam load of the air unit remains basically unchanged. The load of the 9.8MPa steam turbine generator 6 is adjusted according to the amount of superheated steam sent to the industrial park. The boiler load is adjusted according to the changes in the 9.8MPa superheated steam pipeline network 3. The first desuperheater and pressure reducer 5 can be in hot standby mode and adjusted for use in emergency situations.

[0039] The 3.8MPa external supply pressure reducing valve 25 is normally closed or in hot standby mode. When the 9.8MPa steam turbine generator 6 stops due to abnormal conditions, the 3.8MPa external supply pressure reducing valve 25 is opened and the 9.8MPa steam turbine shut-off valve 30 is closed. The superheated steam supplied to the external supply park is then supplied by the 3.8MPa superheated steam pressure reducing valve to ensure the needs of the steam users in the park.

[0040] The benefits of supplying steam to users in the industrial park are higher than those of using it for power generation by steam turbines or driving circulating water pumps 41. The cost of steam produced as a byproduct of the ammonia synthesis unit is lower than the cost of steam produced by the boiler. Therefore, the stability of the second 0.5MPa saturated steam network 35 is ensured by adjusting the load of the 0.5MPa steam turbine generator. If steam users in the industrial park can be supplied directly with low-pressure steam, there is no need to supply high-pressure steam with reduced pressure, thus reducing the waste of steam energy.

[0041] Therefore, this invention employs the aforementioned system for optimizing and efficiently utilizing steam. By combining steam cascade power generation with external supply, it achieves efficient recovery and utilization of steam potential energy and thermal energy. By optimizing the pipeline structure and using methods such as superheated steam supplementation and waste heat steam pressurization, it reduces direct pressure reduction losses, significantly lowers high-pressure steam consumption, and makes it possible for a single boiler to operate stably at high load, thereby improving boiler efficiency. At the same time, by separating the superheated and saturated steam pipelines and achieving precise external supply of by-product steam, it further improves the overall energy utilization efficiency.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A system for optimizing and efficiently utilizing steam, characterized in that: It includes a 9.8MPa steam treatment device, a 4.3MPa steam treatment device, a 3.8MPa steam treatment device, a 2.5MPa steam treatment device, a 1.5MPa steam treatment device, and a 0.5MPa steam treatment device. The 9.8MPa steam treatment device is connected to the 2.5MPa and 3.8MPa steam treatment devices, respectively. The 3.8MPa steam treatment device is connected to the 4.3MPa and 2.5MPa steam treatment devices, respectively. The 2.5MPa steam treatment device is connected to the 1.5MPa, 0.5MPa, and 4.3MPa steam treatment devices, respectively. The 1.5MPa steam treatment device is connected to the 0.5MPa steam treatment device.

2. The system for optimizing and efficiently utilizing steam according to claim 1, characterized in that: The 9.8MPa steam treatment unit includes Boiler No. 1, Boiler No. 2, a 9.8MPa superheated steam pipeline network, an air separation unit, a first desuperheater and pressure reducer, a 9.8MPa steam turbine generator, and a first steam turbine. Boiler No. 1, Boiler No. 2, the air separation unit, the first desuperheater and pressure reducer, and the first steam turbine are all connected to the 9.8MPa superheated steam pipeline network. The 9.8MPa superheated steam pipeline network is connected to the 3.8MPa steam treatment unit through the first desuperheater and pressure reducer. The first steam turbine is connected to both the 9.8MPa steam turbine generator and the 2.5MPa steam treatment unit.

3. The system for optimizing and efficiently utilizing steam according to claim 1, characterized in that: The 4.3MPa steam treatment unit includes a 4.3MPa steam drum, a steam heater, a 4.3MPa steam turbine generator, and a second steam turbine. The 4.3MPa steam drum is connected to both the steam heater and the second steam turbine. The second steam turbine is connected to both the 4.3MPa steam turbine generator and the 2.5MPa steam treatment unit. The steam heater is connected to the 3.8MPa steam treatment unit.

4. The system for optimizing and efficiently utilizing steam according to claim 2, characterized in that: The 3.8MPa steam treatment unit includes a 3.8MPa superheated steam pipeline network, a superheated steam pipeline network within the industrial park, a third steam turbine, an ice machine, a sulfur recovery by-product unit, an ammonia synthesis by-product unit, a fourth steam turbine, a syngas compressor, a fifth steam turbine, a CO2 compressor, a low-pressure superheated steam desuperheater and pressure reducer, a high-pressure superheated steam desuperheater and pressure reducer, and a second desuperheater and pressure reducer. The 3.8MPa superheated steam pipeline network is connected to the superheated steam pipeline network within the industrial park, the third steam turbine, the sulfur recovery by-product unit, the ammonia synthesis by-product unit, the fourth steam turbine, the fifth steam turbine, the first desuperheater and pressure reducer, and the second desuperheater and pressure reducer. The third steam turbine is connected to the ice machine, the fourth steam turbine is connected to the syngas compressor, and the fifth steam turbine is connected to the CO2 compressor. The superheated steam pipeline network within the industrial park is connected to the low-pressure superheated steam desuperheater and pressure reducer and the high-pressure superheated steam desuperheater and pressure reducer. The second desuperheater and pressure reducer is connected to the 2.5MPa steam treatment unit.

5. The system for optimizing and efficiently utilizing steam according to claim 4, characterized in that: A 4.3MPa steam pressure reducing valve is installed between the 3.8MPa superheated steam pipeline and the steam heater, and a 3.8MPa external supply pressure reducing valve is installed between the 3.8MPa superheated steam pipeline and the superheated steam pipeline of the industrial park.

6. The system for optimizing and efficiently utilizing steam according to claim 4, characterized in that: The 2.5MPa steam treatment unit includes a 2.5MPa saturated steam pipeline network, a 2.5MPa steam drum for conversion, a urea system, and a third desuperheater and pressure reducer. The 2.5MPa saturated steam pipeline network is connected to the second desuperheater and pressure reducer, the second steam turbine, the 2.5MPa steam drum for conversion, the urea system, and the third desuperheater and pressure reducer.

7. A system for optimizing and efficiently utilizing steam according to claim 6, characterized in that: The first steam turbine is connected to the 2.5MPa saturated steam pipeline and the superheated steam pipeline of the industrial park, respectively. A 9.8MPa steam turbine shut-off valve is installed between the first steam turbine and the superheated steam pipeline of the industrial park.

8. A system for optimizing and efficiently utilizing steam according to claim 6, characterized in that: The 1.5MPa steam treatment unit includes a 1.5MPa saturated steam pipeline network in the industrial park, a fourth desuperheater and pressure reducer, a steam compressor, and a 1.5MPa waste boiler for conversion and synthesis. The steam compressor is connected to the 2.5MPa saturated steam pipeline network and the 1.5MPa waste boiler for conversion and synthesis. The 1.5MPa waste boiler for conversion and synthesis is connected to the 1.5MPa saturated steam pipeline network in the industrial park and the 0.5MPa steam treatment unit. The 1.5MPa saturated steam pipeline network in the industrial park is connected to the fourth desuperheater and pressure reducer.

9. A system for optimizing and efficiently utilizing steam according to claim 8, characterized in that: The 0.5MPa steam treatment unit includes a first 0.5MPa saturated steam pipeline network, a 0.5MPa waste boiler, a stripping tower, a process deaeration mechanism, a 0.5MPa steam turbine engine, a sixth steam turbine, a circulating water pump, and a second 0.5MPa saturated steam pipeline network. The first 0.5MPa saturated steam pipeline network is connected to the 0.5MPa waste boiler, the stripping tower, the process deaeration mechanism, and the sixth steam turbine. The sixth steam turbine is connected to the 0.5MPa steam turbine engine and the circulating water pump.

10. A system for optimizing and efficiently utilizing steam according to claim 9, characterized in that: A 1.5MPa minus 0.5MPa pressure reducing valve is installed between the second 0.5MPa saturated steam pipeline and the 1.5MPa waste boiler for conversion and synthesis. The second 0.5MPa saturated steam pipeline is also connected to the third desuperheater and pressure reducer.

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