High-pressure steam extraction assembly and ultra-supercritical adjustable steam extraction turbine

Abstract

The utility model discloses a high-pressure steam extraction assembly and an ultra-supercritical adjustable steam extraction turbine, and relates to the technical field of turbines. The problems that heat is wasted and coal consumption is increased due to the fact that an existing ultrahigh-pressure heat supply steam extraction mode adopts a steam temperature and pressure reduction mode are solved. The steam supplementing device comprises a high-pressure cylinder, a steam supplementing pipeline and a three-way connector, the steam supplementing pipeline is arranged between the high-pressure cylinder and a steam supplementing valve, one end of the steam supplementing pipeline is communicated with the steam supplementing valve, and the other end of the steam supplementing pipeline is communicated with the high-pressure cylinder through the three-way connector. The three-way connector is arranged behind the high-pressure cylinder through flow of the fifth level, the pressure and temperature of steam after the high-pressure cylinder through flow of the fifth level are closest to the standard of an industrial park, and the three-way connector can mix high-temperature steam in the steam supplementing valve and steam after acting in the cylinder and extract the mixed steam, so that the temperature and pressure of the steam are adjusted; and moreover, temperature and pressure reduction is not needed, so that the waste of heat is avoided, and the coal consumption is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine technology, specifically to a high-pressure steam extraction assembly and an ultra-supercritical adjustable steam extraction steam turbine. Background Technology

[0002] Industrial heat demand accounts for about 70% of my country's total heat demand, and steam demand is becoming more centralized and large-scale. At present, centralized heating in industrial parks has basically formed a heating pattern that is "mainly based on coal-fired cogeneration and centralized heating in large boiler rooms, supplemented by decentralized coal-fired boilers and other clean (or renewable) energy heating".

[0003] With the expansion of industrial parks and the continuous development of technology, some energy and chemical industrial parks have different requirements for steam pressure, with the highest pressure reaching the parameter range of ultra-high pressure steam. Currently, ultra-high pressure heating steam extraction adopts a steam desuperheating and depressurization method. This extraction method directly supplies the main steam to the industrial park. At this time, the steam pressure and temperature are too high to meet the needs of the industrial park. Therefore, it is necessary to desuperheat and depressurize until it meets the usage standards of the industrial park. During the desuperheating and depressurization process, the steam wastes heat and increases coal consumption.

[0004] In summary, the existing ultra-high pressure heating steam extraction method, which uses steam desuperheating and pressure reduction, results in a waste of heat and an increase in coal consumption. Utility Model Content

[0005] The purpose of this invention is to solve the problem of wasted heat and increased coal consumption caused by using steam desuperheating and pressure reduction methods in ultra-high pressure heating steam extraction. Therefore, this invention provides a high-pressure steam extraction assembly and an ultra-supercritical adjustable steam extraction turbine.

[0006] The technical solution of this utility model is: a high-pressure steam extraction assembly, including: a high-pressure cylinder, a steam injection pipe and a three-way connector, wherein steam injection valves are arranged on both sides of the high-pressure cylinder, the steam injection valves are used to inject steam into the high-pressure cylinder, and the steam injection pipe is arranged between the high-pressure cylinder and the steam injection valves;

[0007] One end of the steam replenishment pipe is connected to the steam replenishment valve, and the other end of the steam replenishment pipe is connected to the high-pressure cylinder through the tee connector. The tee connector is located after the high-pressure flow stage 5 of the high-pressure cylinder, and the tee connector has an ultra-high pressure steam extraction port.

[0008] Furthermore, the supplementary steam valve and the main steam valve of the turbine unit are an integrated structure.

[0009] An ultra-supercritical adjustable extraction steam turbine includes: a first intermediate-pressure cylinder, a second intermediate-pressure cylinder, a low-pressure cylinder, and a high-pressure extraction steam assembly as described in any one of the above embodiments, wherein the first intermediate-pressure cylinder has a high-pressure extraction port and a low-pressure extraction steam port.

[0010] Furthermore, the exhaust port or inlet port of the first intermediate pressure cylinder is connected to the boiler reheater, and the high-pressure extraction port is located on the middle section of the boiler reheater.

[0011] Furthermore, intermediate adjustment valves are respectively provided on both sides of the first intermediate pressure cylinder, and the high-pressure steam extraction parameters are adjusted through the intermediate adjustment valves.

[0012] Furthermore, the central regulating valve has four symmetrically arranged valves, and the four central regulating valves are silencer-type valves.

[0013] Furthermore, the first intermediate-pressure cylinder and the second intermediate-pressure cylinder are connected by a conveying pipeline, and the low-pressure steam extraction port is located on the conveying pipeline.

[0014] Furthermore, a steam extraction disc valve is installed at the low-pressure extraction port of the conveying pipeline, and the low-pressure extraction parameters are adjusted through the steam extraction disc valve.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The high-pressure steam extraction assembly provided by this utility model has an ultra-high-pressure steam extraction port located on a three-way connector. The three-way connector is set after the fifth stage of flow through the high-pressure cylinder. The steam pressure and temperature after the fifth stage of flow through the high-pressure cylinder are closest to the standard of the industrial park. The three-way connector can mix and extract the high-temperature steam in the steam replenishment valve with the steam after work in the cylinder, thereby realizing the adjustment of the steam temperature and pressure to meet the use standard of the industrial park. Moreover, there is no need for de-cooling and de-pressure reduction, avoiding heat waste and thus reducing coal consumption.

[0017] 2. The high-pressure steam extraction assembly provided by this utility model integrates the make-up steam valve and the main steam valve into a more compact and efficient structure. This integrated structure design can reduce losses during the steam flow process and improve the overall efficiency of the steam turbine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 yes Figure 1 Top view;

[0020] Figure 3 yes Figure 1 Sectional view at point AA;

[0021] Figure 4 yes Figure 2 Sectional view at point BB.

[0022] In the diagram: 1. High-pressure cylinder; 2. Steam injection pipeline; 3. T-joint; 4. Steam injection valve; 5. Ultra-high pressure steam extraction port; 6. First intermediate-pressure cylinder; 7. Low-pressure cylinder; 8. Low-pressure steam extraction port; 9. Intermediate regulating valve; 10. Delivery pipeline; 11. Steam extraction disc valve; 12. Second intermediate-pressure cylinder. Detailed Implementation

[0023] Specific implementation method one: Combining Figures 1 to 3 This embodiment describes a high-pressure steam extraction assembly, including a high-pressure cylinder 1, a steam injection pipe 2, and a three-way connector 3. Steam injection valves 4 are arranged on both sides of the high-pressure cylinder 1, and the steam injection valves 4 are used to inject steam into the high-pressure cylinder 1. The steam injection pipe 2 is located between the high-pressure cylinder 1 and the steam injection valves 4. One end of the steam injection pipe 2 is connected to the steam injection valve 4, and the other end of the steam injection pipe 2 is connected to the high-pressure cylinder 1 through the three-way connector 3. The three-way connector 3 is located after the high-pressure flow stage 5 of the high-pressure cylinder 1 and has an ultra-high-pressure steam extraction port 5. Specifically, the high-pressure cylinder 1 is equipped with... There is a steam injection pipe, and the steam injection pipe 2 is welded to the steam injection pipe. There are three situations when extracting steam at ultra-high pressure. The first is the "maximum electrical load of rated extraction steam" condition. At this time, the steam injection valve 4 is opened to mix the supplementary steam with the steam, thereby increasing its temperature to meet the extraction steam temperature requirements. The second is the maximum extraction steam condition. At this time, the steam injection valve 4 is opened. The steam coming from the steam injection valve 4 is given priority to supply ultra-high pressure heating extraction steam, and the remaining steam is added to the flow path to do work. The third is the "minimum electrical load of rated extraction steam" condition. At this time, the steam injection valve 4 is closed, and heating extraction steam is directly supplied through the main steam in the high-pressure cylinder 1.

[0024] In this embodiment, the high-pressure steam extraction assembly has an ultra-high-pressure steam extraction port 5 located on a three-way connector 3. The three-way connector 3 is positioned at the fifth stage of the high-pressure cylinder 1. The steam pressure and temperature at the fifth stage of the high-pressure cylinder 1 are closest to the standards of the industrial park. The three-way connector 3 can mix and extract the high-temperature steam in the steam replenishment valve 4 with the steam after it has done work in the cylinder, thereby adjusting the temperature and pressure of the steam to meet the usage standards of the industrial park. Furthermore, it eliminates the need for de-cooling and de-pressure reduction, avoiding heat waste and thus reducing coal consumption.

[0025] Specific Implementation Method Two: Combining Figure 1 , Figure 2This embodiment differs from Specific Embodiment 1 in that the make-up steam valve 4 and the main steam valve of the turbine unit are integrated into a single structure. This integration creates a more compact and efficient structure, reducing losses during steam flow and improving the overall efficiency of the turbine. The main steam valve supplies main steam to the high-pressure cylinder 1, where it performs work. The make-up steam valve 4 is located at the fifth stage of the high-pressure cylinder 1, where the steam temperature has decreased due to the work already performed, best meeting the standards for industrial park use. Of course, the above description is not limiting; as an alternative embodiment, the make-up steam valve 4 and the main steam valve can also be separate structures. Other components and connections are the same as in Specific Embodiment 1.

[0026] Specific implementation method three: Combining Figures 1 to 4 This embodiment also provides an ultra-supercritical adjustable extraction steam turbine, comprising: a first intermediate-pressure cylinder 6, a second intermediate-pressure cylinder 12, a low-pressure cylinder 7, and the aforementioned high-pressure extraction assembly. The first intermediate-pressure cylinder 6 has a high-pressure extraction port and a low-pressure extraction port 8. During ultra-high-pressure extraction, no desuperheating or depressurization is required, reducing energy waste and lowering operating costs. Other components and connections are the same as in either embodiment one or two.

[0027] Specific implementation method four: Combination Figure 1 This embodiment differs from Specific Embodiment Three in that the exhaust or inlet of the first intermediate-pressure cylinder 6 is connected to the boiler reheater, and the high-pressure extraction port is located in the middle section of the boiler reheater. Extraction at this location ensures that the heating pressure and heating capacity meet the requirements, making it highly feasible. Other components and connections are the same as in Specific Embodiment Three.

[0028] Specific Implementation Method Five: Combining Figure 4 This embodiment differs from specific embodiment four in that it has intermediate regulating valves 9 on both sides of the first intermediate-pressure cylinder 6. The high-pressure extraction parameters are adjusted via these valves. When performing low-load extraction, the intermediate regulating valves are required for regulation. The steam flow is adjusted through the valve structure, which is less prone to metal deformation and does not affect the overall workmanship. Other components and connections are the same as in specific embodiment four.

[0029] Specific Implementation Method Six: Combination Figure 4This embodiment differs from specific embodiment five in that it has four symmetrically arranged intermediate regulating valves 9. These four intermediate regulating valves 9 are silencer-type valves. The silencer structure allows the valves to operate reliably and precisely adjust the steam flow rate under conditions of large pressure differential, small flow rate, and small opening, thus achieving the specified regulation capacity requirements. The operating principle of the intermediate regulating valves 9 is as follows: 1. During start-up and load increase, all four regulating valves participate in regulation simultaneously. 2. During high-load steam extraction, if the extraction pressure requirements can be met without adjustment, then the four intermediate regulating valves... 9. No adjustment is made. III. When the load decreases and steam is extracted, to ensure the extraction pressure, all four intermediate regulating valves 9 need to be closed simultaneously. First, close the orifice valve, then close the shut-off valve. After the shut-off valve reaches 15% of its full stroke, maintain the pressure before the valve and switch valves until the shut-off valve is completely closed. Subsequent adjustments are all completed by the orifice valve. IV. When the load increases, if the load rises during steam extraction, the load change must first be addressed by opening the orifice valve larger. If the load continues to increase, the shut-off valve is opened larger. During the opening of the shut-off valve, the orifice valve needs to be closed smaller. Other components and connections are the same as in specific implementation method five.

[0030] Specific implementation method seven: Combining Figure 2 This embodiment differs from Specific Embodiment Three in that the first intermediate-pressure cylinder 6 and the second intermediate-pressure cylinder are connected by a conveying pipe 10, the low-pressure extraction port 8 is located on the conveying pipe 10, and there are two bearings after the intermediate-pressure stage, each bearing corresponding to one rotor, reducing deflection and thus improving rotor stability. Other components and connections are the same as in Specific Embodiment Three.

[0031] Specific implementation method eight: Combination Figures 2 to 4 This embodiment differs from specific embodiment seven in that a steam extraction disc valve 11 is installed at the low-pressure steam extraction port 8 of the conveying pipeline 10. The low-pressure steam extraction parameters are adjusted through the steam extraction disc valve 11. The steam extraction disc valve 11 is less prone to deformation and jamming during use, resulting in better performance. Other components and connections are the same as in specific embodiment seven.

[0032] The working principle of this implementation method is as follows:

[0033] When performing ultra-high pressure steam extraction, if the operation is under the "maximum electrical load" condition of rated steam extraction, the make-up steam valve 4 is opened to mix the make-up steam with the steam, thereby increasing its temperature to meet the steam extraction temperature requirements. If the operation is under the "maximum steam extraction" condition, the make-up steam valve 4 is opened, and the steam coming from the make-up steam valve 4 is given priority to supply ultra-high pressure heating steam extraction. The remaining steam is added to the flow path to do work. If the operation is under the "minimum electrical load" condition of rated steam extraction, the make-up steam valve 4 is closed, and the heating steam extraction is directly supplied by the main steam in the high-pressure cylinder 1. The high-pressure steam extraction and low-pressure steam extraction can be adjusted by valves.

[0034] The content of this utility model is not limited to the above-described embodiments; a combination of one or more specific embodiments can also achieve the purpose of the utility model.

Claims

1. A high-pressure steam extraction assembly, comprising: The high-pressure cylinder (1), the steam supply pipe (2) and the three-way connector (3) are provided. Steam supply valves (4) are arranged on both sides of the high-pressure cylinder (1). The steam supply valves (4) are used to supply steam to the high-pressure cylinder (1). The steam supply pipe (2) is located between the high-pressure cylinder (1) and the steam supply valves (4). The feature is that one end of the steam replenishment pipe (2) is connected to the steam replenishment valve (4), and the other end of the steam replenishment pipe (2) is connected to the high-pressure cylinder (1) through the three-way connector (3). The three-way connector (3) is located after the high-pressure flow stage of the high-pressure cylinder (1), and the three-way connector (3) has an ultra-high pressure steam extraction port (5).

2. The high-pressure steam extraction assembly according to claim 1, characterized in that, The supplementary steam valve (4) and the main steam valve of the turbine unit are an integrated structure.

3. A supercritical adjustable extraction steam turbine, characterized in that, include: The first intermediate pressure cylinder (6), the second intermediate pressure cylinder (12), the low pressure cylinder (7), and the high pressure extraction assembly as described in claim 1 or 2, wherein the first intermediate pressure cylinder (6) has a high pressure extraction port and a low pressure extraction port (8).

4. The ultra-supercritical adjustable extraction steam turbine according to claim 3, characterized in that, The exhaust port or inlet port of the first intermediate pressure cylinder (6) is connected to the boiler reheater, and the high pressure extraction port is located on the middle section of the boiler reheater.

5. The ultra-supercritical adjustable extraction steam turbine according to claim 4, characterized in that, The first intermediate pressure cylinder (6) is provided with intermediate adjustment valves (9) on both sides, and the high pressure extraction steam parameters are adjusted by the intermediate adjustment valves (9).

6. The ultra-supercritical adjustable extraction steam turbine according to claim 5, characterized in that, The central regulating valve (9) has four symmetrically arranged valves, and the four central regulating valves (9) are silencer-type valves.

7. The ultra-supercritical adjustable extraction steam turbine according to claim 3, characterized in that, The first intermediate pressure cylinder (6) and the second intermediate pressure cylinder (12) are connected by a conveying pipe (10), and the low-pressure steam extraction port (8) is provided on the conveying pipe (10).

8. A supercritical adjustable extraction steam turbine according to claim 7, characterized in that, A steam extraction disc valve (11) is provided at the low-pressure steam extraction port (8) of the conveying pipeline (10), and the low-pressure steam extraction parameters are adjusted by the steam extraction disc valve (11).

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