A dual-parallel steam supply steam quality reshaping device

Abstract

The utility model relates to a kind of double-path parallel steam supply's steam quality reshaping device, including middle-high pressure steam pipeline, the middle-high pressure steam pipeline one end is connected after corresponding middle-high pressure steam pipe network, in the middle-high pressure steam pipeline, according to the middle-high pressure steam flow direction, pressure reducing valve, regulating valve are sequentially arranged, still include low pressure steam pipeline, the low pressure steam pipeline is connected with the middle-high pressure steam pipeline before regulating valve import pressure gauge, in the middle-high pressure pipeline connection point, according to mixed steam flow direction, oxygen-removing water pipeline is sequentially arranged after steam distributor, the middle-high pressure pipeline is connected with vacuum system, can stabilize vacuum system input steam quality.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, specifically to a steam quality reshaping device with dual-path parallel steam supply. Background Technology

[0002] The vacuum steam pumped at the top of the pressure reducing tower in a pressure reducing unit is low-pressure steam from the steam pipeline network. Because the pressure reducing and vacuuming system requires high steam pressure stability, significant fluctuations in the low-pressure steam pipeline network pressure will cause fluctuations in the vacuum level at the top of the pressure reducing tower, affecting its normal operation. The instability of the low-pressure steam pipeline network pressure leads to fluctuations in the vacuum level at the top of the pressure reducing tower. The vacuuming system has extremely high requirements for the stability of steam pressure or flow rate; fluctuations can lead to abnormal product quality, reduced fraction cutting accuracy, and, moreover, uncontrolled vacuum levels may cause unplanned shutdowns of the entire plant, resulting in significant economic losses. In existing technologies, single-stage pressure regulating valves and buffer tank solutions have lag in dynamic response, and single-stage pressure reducing structures have poor adaptability to sudden changes in flow or pressure. When the low-pressure steam supply drops sharply, the medium-pressure side cannot compensate quickly, resulting in excessive fluctuations in the outlet pressure. Simply increasing the pipe diameter, the volume of the gas storage tank, or setting up a separate backup boiler requires additional investment, leading to increased plant operating costs. Utility Model Content

[0003] This invention provides a steam quality reshaping device with dual parallel steam supply to solve the technical defects of the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a steam quality reshaping device with dual-path parallel steam supply, comprising a medium- and high-pressure steam pipeline, one end of which is connected to a medium- and high-pressure steam network. A pressure reducing valve and a regulating valve are sequentially arranged on the medium- and high-pressure steam pipeline according to the direction of medium- and high-pressure steam flow. The device also includes a low-pressure steam pipeline, which is connected to the medium- and high-pressure steam pipeline before the pressure gauge at the inlet of the regulating valve. After the connection point on the medium- and high-pressure pipeline, a deoxygenated water pipeline is sequentially arranged according to the direction of mixed steam flow. After a steam separator, the medium- and high-pressure pipeline is connected to a vacuum system.

[0005] Specifically, the low-pressure steam pipeline is provided with a branch line that connects to the medium- and high-pressure steam pipeline.

[0006] Specifically, the medium- and high-pressure steam pipeline is equipped with an isolation valve before the pressure reducing valve.

[0007] Specifically, the medium- and high-pressure steam pipelines and / or low-pressure steam pipelines are equipped with drains.

[0008] Specifically, the medium- and high-pressure steam pipeline is a medium-pressure steam pipeline.

[0009] Specifically, the low-pressure steam pipeline is equipped with a pressure gauge, and the pressure gauge and regulating valve are connected to the control computer. When the pressure of the low-pressure steam pipeline is less than the set threshold, the regulating valve is automatically triggered to replenish the pressure. When the pressure of the low-pressure steam pipeline is equal to or greater than the set threshold, the regulating valve replenishment is turned off.

[0010] Specifically, a buffer mixing chamber is provided before the deoxygenated water pipeline on the medium- and high-pressure pipeline.

[0011] Specifically, the water mist nozzles of the deoxygenated water pipeline are pressure-type centrifugal atomizing nozzles.

[0012] Compared with existing technologies, the technical solution of this application has the following beneficial effects: This invention utilizes dual-path parallel steam supply to construct a graded pressure gradient compensation mechanism, dynamically incrementally replenishing the supply, shifting from passive containment to active intervention, and interconnecting and scheduling the pipeline network (utilizing existing medium and high pressure pipeline resources without the need for additional steam generation equipment), thus optimizing system-level energy efficiency. The setting of pre- and post-pressure gauges for the pressure reducing valve enables precise control of steam pressure. The deoxygenated water spray intervention point is located downstream of the pressure reducing valve, simultaneously addressing: the risk of overheating corrosion and steam dryness correction; a redundant safety architecture (dual gate valves, ground-level drainage, and bypass pipelines) allows for continued operation under certain conditions even in fault modes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] The components include: 1. Low-pressure steam pipeline; 2. Medium- and high-pressure steam pipeline; 3. Deoxygenated water pipeline; and 4. Steam separator. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] Please see Figure 1This utility model provides the following technical solution: a steam quality reshaping device with dual-path parallel steam supply, including a medium-high pressure steam pipeline 2. One end of the medium-high pressure steam pipeline 2 is connected to a medium-high pressure steam network. A pressure reducing valve and a regulating valve are sequentially arranged on the medium-high pressure steam pipeline 2 according to the direction of medium-high pressure steam flow. It also includes a low-pressure steam pipeline 1. The low-pressure steam pipeline 1 is connected to the medium-high pressure steam pipeline 2 before the pressure gauge at the inlet of the regulating valve. After the connection point on the medium-high pressure pipeline 2, a deoxygenated water pipeline 3 and a steam separator 4 are sequentially arranged according to the direction of mixed steam flow. The medium-high pressure pipeline 2 is connected to a vacuum system. In existing technologies, fluctuations in steam pressure and instability in the low-pressure steam pipeline network lead to fluctuations in the vacuum level at the top of the vacuum distillation tower. Refining processes are sensitive, and the vacuum system has extremely high requirements for the stability of steam pressure / flow rate, resulting in abnormal product quality, reduced fraction cutting accuracy, and uncontrolled vacuum levels that may cause unplanned shutdowns of the entire plant, affecting production continuity and ultimately leading to huge economic losses. This application proposes a dual-source complementary architecture: the main route is the existing low-pressure steam (base load), and the auxiliary route is the newly added medium-pressure steam that is depressurized to a certain value (for peak shaving compensation). When the low-pressure side pressure is less than the set threshold, the incremental supply to the medium-pressure side is automatically triggered, forming a "dynamic pressure pool". The medium-pressure pipeline provides an additional steam source to compensate for the low-pressure steam shortage. Isolation valves and drains enable physical isolation for maintenance and dehydration to prevent freezing and blockage, significantly reducing the failure rate in winter. Pressure reducing valves lower the high pressure to meet the operating conditions. The deoxygenated water spray system precisely controls the steam temperature (avoiding overheating damage to the ejector nozzles). Anti-interference capabilities are enhanced. The pressure gauge at the front end of the regulating valve captures transient fluctuations in the pipeline network, allowing the regulating valve to make dynamic adjustments. The pressure gauge at the back end provides feedback on the actual inlet parameters. The redundant design concept, with a bypass channel independent of the original system, eliminates the risk of single-point failure. Manual / automatic dual-mode switching adapts to different operating conditions.

[0017] Specifically, the low-pressure steam pipeline 1 is provided with a branch line connected to the medium- and high-pressure steam pipeline 2, so that it can still maintain certain operating conditions under fault mode.

[0018] Specifically, the medium- and high-pressure steam pipeline 2 is equipped with an isolation valve before the pressure reducing valve, which can quickly cut off the gas source in an emergency.

[0019] Specifically, the medium- and high-pressure steam pipeline 2 and / or the low-pressure steam pipeline 1 are equipped with a drain to discharge accumulated liquid (condensate, rainwater), sediment (rust, welding slag) or residual media, ensuring the safe operation of the system.

[0020] Specifically, the medium-high pressure steam pipeline 2 is a medium-pressure steam pipeline, which can avoid excessive loss when the high-pressure steam is depressurized when there is sufficient medium-pressure steam.

[0021] Specifically, the low-pressure steam pipeline 1 is equipped with a pressure gauge, and the pressure gauge and regulating valve are connected to the control computer. When the pressure of the low-pressure steam pipeline 1 is less than the set threshold, the regulating valve is automatically triggered to replenish the pressure. When the pressure of the low-pressure steam pipeline 1 is equal to or greater than the set threshold, the regulating valve replenishment is turned off, replacing manual intervention and achieving automatic, timely and accurate management.

[0022] Specifically, a buffer mixing chamber is provided before the deoxygenated water pipeline 3 on the medium and high pressure pipeline. If the medium and high pressure steam and the low pressure steam directly merge, it may cause flow oscillation. The buffer mixing chamber can reduce the flow velocity difference through the expansion section, so that the two steams are evenly mixed before entering the regulating valve.

[0023] Specifically, the water mist nozzle of the deoxygenated water pipeline 3 adopts a pressure centrifugal atomizing nozzle, which can reduce energy consumption.

[0024] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steam quality reshaping device with dual parallel steam supply, characterized in that... The system includes a medium- and high-pressure steam pipeline (2), one end of which is connected to a medium- and high-pressure steam network. Pressure reducing valves and regulating valves are sequentially installed on the medium- and high-pressure steam pipeline (2) according to the direction of medium- and high-pressure steam flow. The system also includes a low-pressure steam pipeline (1), which is connected to the medium- and high-pressure steam pipeline (2) before the pressure gauge at the inlet of the regulating valve. After the connection point on the medium- and high-pressure steam pipeline (2), deoxygenated water pipelines (3) are sequentially installed according to the direction of mixed steam flow. After the steam separator (4), the medium- and high-pressure steam pipeline (2) is connected to a vacuum system.

2. The steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... The low-pressure steam pipeline (1) is provided with a branch line that connects to the medium- and high-pressure steam pipeline (2).

3. A steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... The medium- and high-pressure steam pipeline (2) is equipped with an isolation valve before the pressure reducing valve.

4. A steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... The medium- and high-pressure steam pipeline (2) and / or the low-pressure steam pipeline (1) are equipped with a drain.

5. A steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... The medium- and high-pressure steam pipeline (2) is a medium-pressure steam pipeline.

6. A steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... The low-pressure steam pipeline (1) is equipped with a pressure gauge. The pressure gauge and the regulating valve are connected to the control computer. When the pressure of the low-pressure steam pipeline (1) is less than the set threshold, the regulating valve is automatically triggered to replenish the pressure. When the pressure of the low-pressure steam pipeline (1) is equal to or greater than the set threshold, the regulating valve replenishment is turned off.

7. A steam quality reshaping device with dual-path parallel steam supply according to claim 1, characterized in that... A buffer mixing chamber is provided before the deoxygenated water pipeline (3) on the medium-high pressure steam pipeline (2).

8. The steam quality reshaping device with dual-path parallel steam supply according to any one of claims 1 to 7, characterized in that... The deoxygenated water pipeline (3) uses a pressure centrifugal atomizing nozzle for its water mist nozzle.

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