Medium-pressure steam recovery system

Abstract

The utility model discloses a medium-pressure steam recovery system in the technical field of steam recovery, which comprises a new energy boundary area and a methanol boundary area, a medium-pressure steam pipeline is arranged between the new energy boundary area and the methanol boundary area, and the new energy boundary area comprises a first temperature and pressure reduction station. A new energy internal medium-pressure steam pipeline is arranged at the bottom of the first temperature and pressure reduction station, a first temperature and pressure reduction station medium-pressure steam outlet valve is arranged on the new energy internal medium-pressure steam pipeline, and the left side of the new energy internal medium-pressure steam pipeline is connected with a crude benzene process inlet medium-pressure steam valve through a guide pipe; the system solves the problems that in the process that steam is conveyed to the coking debenzolization process to serve as a heat source of a rich oil heater and a regenerator, due to the fact that the distance is long, the temperature of the steam can be reduced, the requirement cannot be met, and the steam can be used as a heat source of the rich oil heater and the regenerator. And waste is easily caused.

Description

Technical Field

[0001] The utility model relates to the technical field of steam recovery, in particular to a medium-pressure steam recovery system. Background Art

[0002] After the medium-temperature and medium-pressure steam is used, most of it will be directly discharged. When discharging, the medium-temperature and medium-pressure steam still has a certain temperature, and directly discarding and discharging it is very wasteful, which does not conform to the green concept of energy conservation, emission reduction, low-carbon and environmental protection.

[0003] During the process of transporting the steam to the coking and debenzolization process for use as the heat source of the rich oil heater and the regenerator, due to the long distance, the steam temperature will drop and cannot meet the requirements, which is likely to cause waste. Summary of the Utility Model

[0004] The purpose of this part is to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. In this part, as well as in the abstract and the name of the utility model of the specification, some simplifications or omissions may be made to avoid obscuring the purpose of this part, the abstract of the specification and the name of the utility model, and such simplifications or omissions shall not be used to limit the scope of the utility model.

[0005] Therefore, the purpose of the utility model is to provide a medium-pressure steam recovery system, which can solve the problem that during the process of transporting the steam to the coking and debenzolization process for use as the heat source of the rich oil heater and the regenerator, due to the long distance, the steam temperature will drop and cannot meet the requirements, which is likely to cause waste.

[0006] To solve the above technical problems, the present utility model provides a medium-pressure steam recovery system, adopting the following technical solutions: It includes a new energy section and a methanol section. A medium-pressure steam pipeline is provided between the new energy section and the methanol section. The new energy section includes a first desuperheating and pressure-reducing station. At the bottom of the first desuperheating and pressure-reducing station, there is a medium-pressure steam pipeline inside the new energy section. On the medium-pressure steam pipeline inside the new energy section, there is a medium-pressure steam outlet valve of the first desuperheating and pressure-reducing station. The left side of the medium-pressure steam pipeline inside the new energy section is connected to a medium-pressure steam valve at the inlet of the crude benzene process through a conduit. The right side of the medium-pressure steam pipeline inside the new energy section is connected to a second desuperheating and pressure-reducing station valve through a conduit. The bottom of the medium-pressure steam pipeline inside the new energy section is connected to a manual methanol-feeding medium-pressure steam valve. The manual methanol-feeding medium-pressure steam valve is connected to an electric methanol-feeding medium-pressure steam valve through a pipeline. The electric methanol-feeding medium-pressure steam valve is connected to the medium-pressure steam pipeline through a pipeline. A fixed pipeline is connected to the medium-pressure steam pipeline. On the fixed pipeline, there is a new energy medium-pressure steam vent valve. The new energy medium-pressure steam vent valve is connected to a new energy steam vent silencer through a pipeline. The medium-pressure steam pipeline is connected to a methanol startup steam vent valve group through a pipeline. The methanol startup steam vent valve group is connected to a methanol startup steam vent silencer through a pipeline. The medium-pressure steam pipeline is connected to a methanol startup steam valve through a pipeline.

[0007] Optionally, the medium-pressure steam valve at the inlet of the crude benzene process is connected to the crude benzene section through a pipeline.

[0008] By adopting the above technical solution, the crude benzene is transported into the medium-pressure steam pipeline inside the new energy section.

[0009] Optionally, the second desuperheating and pressure-reducing station valve is connected to a second desuperheating and pressure-reducing station through a pipeline, and the second desuperheating and pressure-reducing station is connected to the low-pressure steam network.

[0010] By adopting the above technical solution, the steam is depressurized.

[0011] Optionally, the methanol section includes a conversion system, and the methanol startup steam valve is connected to the conversion system through a pipeline.

[0012] By adopting the above technical solution, the whole set of processes is completed.

[0013] Optionally, the methanol start-up steam vent valve group includes a methanol start-up steam vent pipeline connected to the medium-pressure steam pipeline, and the methanol start-up steam vent pipeline is located at one end of the methanol start-up steam valve close to the medium-pressure steam pipeline. A manual methanol start-up steam vent valve and a pneumatic methanol start-up steam vent valve are sequentially installed on the methanol start-up steam vent pipeline. The left end of the methanol start-up steam vent pipeline close to the manual methanol start-up steam vent valve is connected to a methanol start-up steam vent sub-line valve through a conduit, and the other end of the methanol start-up steam vent sub-line valve is connected to the methanol start-up steam vent pipeline at the right end of the pneumatic methanol start-up steam vent valve through a conduit.

[0014] By adopting the above technical solution, the steam is transported.

[0015] Optionally, a methanol start-up steam vent silencer is provided at the other end of the methanol start-up steam vent pipeline.

[0016] By adopting the above technical solution, the pipeline is warmed up.

[0017] In summary, the present utility model includes at least one of the following beneficial effects: By venting between the methanol entering the system valve and pouring the steam into the system after the pipeline warming-up is completed, and venting between the methanol being sent to the coking process and pouring the steam into the system after the pipeline warming-up is completed, it is both energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] Description of the drawing reference numerals: 1. New energy area; 1011. Medium-pressure steam pipeline inside the new energy; 101. Medium-pressure steam outlet valve of the first desuperheating and pressure-reducing station; 102. Medium-pressure steam valve at the inlet of the crude benzene process; 103. Valve of the second desuperheating and pressure-reducing station; 104. Manual medium-pressure steam valve for methanol feeding; 105. Electric medium-pressure steam valve for methanol feeding; 106. Fixed pipeline; 107. New energy medium-pressure steam vent valve; 2. Methanol area; 3. Medium-pressure steam pipeline; 301. Methanol start-up steam valve; 4. First desuperheating and pressure-reducing station; 5. Crude benzene section; 6. Second desuperheating and pressure-reducing station; 7. New energy steam vent silencer; 8. Conversion system; 9. Methanol start-up steam vent valve group; 9011. Methanol start-up steam vent pipeline; 901. Manual methanol start-up steam vent valve; 902. Pneumatic methanol start-up steam vent valve; 903. By-pass valve for methanol start-up steam vent; 10. Methanol start-up steam vent silencer. Detailed implementation manners

[0021] The following further elaborates on the present utility model in conjunction with the attached Figure 1 drawings.

[0022] Embodiment 1. Referring to Figure 1 , in this embodiment, in order to solve the problem that during the process of transporting steam to the coking crude benzene process for use as the heat source of the rich oil heater and the regenerator, due to the long distance, the steam temperature will drop, unable to meet the requirements and prone to waste, the present utility model discloses a medium-pressure steam recovery system, which includes a new energy area 1 and a methanol area 2. A medium-pressure steam pipeline 3 is provided between the new energy area 1 and the methanol area 2. The new energy area 1 includes a first desuperheating and pressure-reducing station 4. The bottom of the first desuperheating and pressure-reducing station 4 is provided with a medium-pressure steam pipeline 1011 inside the new energy. A medium-pressure steam outlet valve 101 of the first desuperheating and pressure-reducing station is provided on the medium-pressure steam pipeline 1011 inside the new energy. The left side of the medium-pressure steam pipeline 1011 inside the new energy is connected with a medium-pressure steam valve 102 at the inlet of the crude benzene process through a conduit. The right side of the medium-pressure steam pipeline 1011 inside the new energy is connected with a valve 103 of the second desuperheating and pressure-reducing station through a conduit. The bottom of the medium-pressure steam pipeline 1011 inside the new energy is connected with a manual medium-pressure steam valve 104 for methanol feeding. The manual medium-pressure steam valve 104 for methanol feeding is connected with an electric medium-pressure steam valve 105 for methanol feeding through a pipeline. The electric medium-pressure steam valve 105 for methanol feeding is connected with the medium-pressure steam pipeline 3 through a pipeline. A fixed pipeline 106 is connected to the medium-pressure steam pipeline 3. A new energy medium-pressure steam vent valve 107 is provided on the fixed pipeline 106. The new energy medium-pressure steam vent valve 107 is connected with a new energy steam vent silencer 7 through a pipeline. The medium-pressure steam pipeline 3 is connected with a methanol start-up steam vent valve group 9 through a pipeline. The methanol start-up steam vent valve group 9 is connected with a methanol start-up steam vent silencer 10 through a pipeline. The medium-pressure steam pipeline 3 is connected with a methanol start-up steam valve 301 through a pipeline.

[0023] Based on the above features, the working principle of this embodiment is as follows: When the methanol plant is in normal production, the externally supplied medium-pressure steam is sent out of the methanol boundary area 2 through the methanol start-up steam valve 301, and sent to the new energy boundary area 1 through the medium-pressure steam pipeline 3. First, the new energy medium-pressure steam vent valve 107 is used to warm up the new energy steam vent silencer 7. After the warming-up is completed, it is sent to the low-pressure steam pipe network through the second desuperheating and pressure-reducing station valve 103 and the second desuperheating and pressure-reducing station 6. If there is a fault in the low-pressure steam pipe network in the new energy boundary area 1 and it cannot receive normally, the medium-pressure steam sent from the methanol boundary area 2 to the new energy boundary area 1 can be vented through the vent valve 107 and the silencer 7. If a fault occurs in the medium-pressure steam pipeline 3, the new energy boundary area 1 closes the manual methanol medium-pressure steam supply valve 104 and the electric methanol medium-pressure steam supply valve 105, the methanol boundary area 2 closes the methanol start-up steam valve 301, opens the new energy medium-pressure steam vent valve 107 to vent the new energy steam vent silencer 7, the methanol start-up steam manual vent valve 901 and the methanol start-up steam pneumatic vent valve 902, and after relieving pressure at two places through the start-up steam silencer 10, it is processed.

[0024] Example Two, referring to Figure 1 , in this embodiment, in order to solve the problem that during the process of transporting steam to the coking decarbonization process for use as the heat source of the rich oil heater and the regenerator, due to the long distance, the steam temperature will drop, unable to meet the requirements, and it is easy to cause waste. Based on the same concept as in the above Example One, this medium-pressure steam recovery system further includes that the medium-pressure steam valve 102 at the inlet of the crude benzene process is connected to the crude benzene section 5 through a pipeline, the second desuperheating and pressure-reducing station valve 103 is connected to the second desuperheating and pressure-reducing station 6 through a pipeline, the second desuperheating and pressure-reducing station 6 is connected to the low-pressure steam pipe network, the methanol boundary area 2 includes a conversion system 8, the methanol start-up steam valve 301 is connected to the conversion system 8 through a pipeline, the methanol start-up steam vent valve group 9 includes a methanol start-up steam vent pipeline 9011 communicated with the medium-pressure steam pipeline 3, and the methanol start-up steam vent pipeline 9011 is located at one end of the methanol start-up steam valve 301 close to the medium-pressure steam pipeline 3. A methanol start-up steam manual vent valve 901 and a methanol start-up steam pneumatic vent valve 902 are successively installed on the methanol start-up steam vent pipeline 9011. The left end of the methanol start-up steam vent pipeline 9011 close to the methanol start-up steam manual vent valve 901 is communicated with a methanol start-up steam vent sub-line valve 903 through a conduit, and the other end of the methanol start-up steam vent sub-line valve 903 is communicated with the methanol start-up steam vent pipeline 9011 at the right end of the methanol start-up steam pneumatic vent valve 902 through a conduit. The other end of the methanol start-up steam vent pipeline 9011 is provided with a methanol start-up steam vent silencer 10.

[0025] Based on the above features, the working principle of this embodiment is as follows: When starting up with methanol, medium-pressure steam passes through the first new energy desuperheating and pressure-reducing station 4. The medium-pressure superheated steam at 9.8 MPa is reduced to superheated steam at 3.8 MPa through the medium-pressure steam outlet valve 101 of the first desuperheating and pressure-reducing station. It is sent out of the new energy boundary area 1 after being reduced in pressure through the manual methanol feeding medium-pressure steam valve 104 and the electric methanol feeding medium-pressure steam valve 105, and is sent to the methanol boundary area 2 through the 4.8 KM medium-pressure steam pipeline 3. First, it enters the methanol start-up steam silencer 10 through the methanol start-up steam vent pipeline 9011, the manual methanol start-up steam vent valve 901, the pneumatic methanol start-up steam vent valve 902, or the bypass methanol start-up steam vent bypass valve 903. After the warm-up of the pipeline is completed, the manual methanol start-up steam vent valve 901 and the pneumatic methanol start-up steam vent valve 902 are gradually closed, and the methanol start-up steam valve 301 is opened to enter the conversion system 8 for use as start-up steam.

[0026] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A medium-pressure steam recovery system, comprising a new energy boundary (1) and a methanol boundary (2), characterized in that: A medium-pressure steam pipeline (3) is provided between the new energy boundary (1) and the methanol boundary (2); the new energy boundary (1) includes a first temperature reduction and pressure reduction station (4); a new energy internal medium-pressure steam pipeline (1011) is provided at the bottom of the first temperature reduction and pressure reduction station (4); a first temperature reduction and pressure reduction station medium-pressure steam outlet valve (101) is provided on the new energy internal medium-pressure steam pipeline (1011); a crude benzene process inlet medium-pressure steam valve (102) is connected to the left side of the new energy internal medium-pressure steam pipeline (1011) via a conduit; a second temperature reduction and pressure reduction station valve (103) is connected to the right side of the new energy internal medium-pressure steam pipeline (1011) via a conduit; a manual methanol delivery medium-pressure steam valve (104) is connected to the bottom of the new energy internal medium-pressure steam pipeline (1011); and the manual methanol delivery medium-pressure steam valve (104) is connected to the right side of the new energy internal medium-pressure steam pipeline (1011). The alcohol medium-pressure steam valve (104) is connected to an electric methanol medium-pressure steam valve (105) through a pipeline. The electric methanol medium-pressure steam valve (105) is connected to a medium-pressure steam pipeline (3) through a pipeline. The medium-pressure steam pipeline (3) is connected to a fixed pipeline (106). The fixed pipeline (106) is provided with a new energy medium-pressure steam vent valve (107). The new energy medium-pressure steam vent valve (107) is connected to a new energy steam vent silencer (7) through a pipeline. The medium-pressure steam pipeline (3) is connected to a methanol start-up steam vent valve group (9) through a pipeline. The methanol start-up steam vent valve group (9) is connected to a methanol start-up steam vent silencer (10) through a pipeline. The medium-pressure steam pipeline (3) is connected to a methanol start-up steam valve (301) through a pipeline.

2. A medium-pressure steam recovery system according to claim 1, characterized in that: The crude benzene process inlet medium-pressure steam valve (102) is connected to the crude benzene section (5) via a pipeline.

3. A medium-pressure steam recovery system according to claim 1, characterized in that: The second temperature reduction and pressure reduction station valve (103) is connected to the second temperature reduction and pressure reduction station (6) via a pipeline, and the second temperature reduction and pressure reduction station (6) is connected to the low-pressure steam pipeline network.

4. A medium-pressure steam recovery system according to claim 1, characterized in that: The methanol boundary area (2) includes a conversion system (8), and the methanol start-up steam valve (301) is connected to the conversion system (8) through a pipeline.

5. A medium-pressure steam recovery system according to claim 1, characterized in that: The methanol start-up steam vent valve group (9) comprises a methanol start-up steam vent pipe (9011) connected to the medium-pressure steam pipe (3), and the methanol start-up steam vent pipe (9011) is located at one end of the methanol start-up steam valve (301) close to the medium-pressure steam pipe (3). A methanol start-up steam manual vent valve (901) and a methanol start-up steam pneumatic vent valve (902) are sequentially installed on the methanol start-up steam vent pipe (9011). The left end of the methanol start-up steam vent pipe (9011) close to the methanol start-up steam manual vent valve (901) is connected to a methanol start-up steam vent secondary line valve (903) through a conduit. The other end of the methanol start-up steam vent secondary line valve (903) is connected to the methanol start-up steam vent pipe (9011) at the right end of the methanol start-up steam pneumatic vent valve (902) through a conduit.

6. A medium-pressure steam recovery system according to claim 5, characterized in that: A methanol startup steam venting muffler (10) is provided at the other end of the methanol startup steam venting pipeline (9011).

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