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

Abstract

The invention 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, the other end of the steam supplementing pipeline is communicated with the high-pressure cylinder through the three-way connector, and the three-way connector is arranged behind the five-stage through-flow of the high-pressure cylinder. The pressure and the temperature of steam flowing through the high-pressure cylinder by five stages are closest to the standard of an industrial park, and the three-way connector can mix and extract high-temperature steam in the steam supplementing valve and steam acting in the steam cylinder, so that the temperature and the pressure of the steam are adjusted, the steam reaches the use standard of the industrial park, temperature and pressure reduction is not needed, and the cost is reduced. The waste of heat is avoided, and the coal consumption is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a high-pressure steam extraction component and an ultra-supercritical adjustable steam extraction steam turbine. Background Art

[0002] my country's industrial heat demand accounts for about 70% of the total heat demand, and steam demand is more centralized and large-scale. At present, centralized heating in industrial parks has basically formed a heating pattern of "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 technical processes, some energy and chemical parks have divided the demand for steam pressure into multiple levels, and the highest pressure has reached the parameter range of ultra-high pressure steam. The current ultra-high pressure heating extraction steam adopts steam cooling and pressure reduction. This steam extraction method directly supplies the main steam to the industrial park. At this time, the pressure and temperature of the steam are too high to meet the needs of the industrial park. Therefore, it is necessary to cool and reduce the pressure until it meets the use standards of the industrial park. The steam will waste heat in the process of cooling and reducing the pressure, thereby increasing coal consumption.

[0004] In summary, the existing ultra-high pressure heating extraction steam using steam temperature reduction and pressure reduction method wastes heat and thus increases coal consumption. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the ultra-high pressure heat extraction steam adopts the steam temperature reduction and pressure reduction method, which wastes heat and increases coal consumption. A high pressure extraction steam component and an ultra-supercritical adjustable extraction steam turbine are provided.

[0006] The technical solution of the present invention is: a high-pressure steam extraction assembly, comprising: a high-pressure cylinder, a steam supplementation pipeline and a three-way joint, wherein steam supplementation valves are arranged on both sides of the high-pressure cylinder, the steam supplementation valve is used to supplement steam to the high-pressure cylinder, and the steam supplementation pipeline is arranged between the high-pressure cylinder and the steam supplementation valve;

[0007] One end of the supplementary steam pipeline is connected to the supplementary steam valve, and the other end of the supplementary steam pipeline is connected to the high-pressure cylinder through the three-way joint. The three-way joint is arranged after the high-pressure flow of the high-pressure cylinder is five levels, and the three-way joint has an ultra-high-pressure steam extraction port.

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

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

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

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

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

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

[0014] Furthermore, a steam extraction butterfly valve is provided at the low-pressure steam extraction port of the delivery pipeline, and the low-pressure steam extraction parameters are adjusted by the steam extraction butterfly valve.

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

[0016] 1. In the high-pressure steam extraction assembly provided by the present invention, the ultra-high-pressure steam extraction port is located on the three-way joint. The three-way joint is arranged after the high-pressure cylinder has passed five levels of flow. The steam pressure and temperature of the high-pressure cylinder after the high-pressure cylinder has passed five levels of flow are closest to the standards of the industrial park. The three-way joint can mix and extract the high-temperature steam in the steam supplement valve with the steam after work in the cylinder, thereby adjusting the temperature and pressure of the steam to meet the use standards of the industrial park, and there is no need to reduce temperature and pressure, thus avoiding heat waste and reducing coal consumption.

[0017] 2. The high-pressure steam extraction assembly provided by the present invention integrates the supplementary steam valve and the main steam valve together to form a more compact and efficient structure. The design of this integrated structure can reduce the loss during the steam flow process and improve the overall efficiency of the steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 yes Figure 1 A top view of

[0020] Figure 3 yes Figure 1 Sectional view at AA in the middle;

[0021] Figure 4 yes Figure 2 Cross-sectional view at the middle BB.

[0022] In the figure: 1. High-pressure cylinder; 2. Supplementary steam pipeline; 3. Three-way joint; 4. Supplementary steam 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 butterfly valve; 12. Second intermediate-pressure cylinder. DETAILED DESCRIPTION

[0023] Specific implementation method 1: Combination Figures 1 to 3 The embodiment of the present invention provides a high-pressure steam extraction assembly, including a high-pressure cylinder 1, a supplementary steam pipeline 2 and a three-way joint 3. Supplementary steam valves 4 are arranged on both sides of the high-pressure cylinder 1. The supplementary steam valve 4 is used to supplement steam to the high-pressure cylinder 1. The supplementary steam pipeline 2 is arranged between the high-pressure cylinder 1 and the supplementary steam valve 4. One end of the supplementary steam pipeline 2 is connected to the supplementary steam valve 4. The other end of the supplementary steam pipeline 2 is connected to the high-pressure cylinder 1 through the three-way joint 3. The three-way joint 3 is arranged after the high-pressure flow of the high-pressure cylinder 1 is five levels. The three-way joint 3 has an ultra-high-pressure steam extraction port 5. Specifically, the high-pressure cylinder 1 is installed with a super-high-pressure steam extraction port 5. There is a supplementary steam intubation pipe, and the supplementary steam pipeline 2 is welded and connected to the supplementary steam intubation pipe. There are three situations during ultra-high pressure steam extraction. The first is the "rated steam extraction maximum electrical load" working condition. At this time, the supplementary steam valve 4 is opened to mix the supplementary steam with the steam to increase its temperature and meet the steam extraction temperature requirement. The second is the maximum steam extraction condition. At this time, the supplementary steam valve 4 is opened, and the steam from the supplementary steam valve 4 is preferentially supplied to ultra-high pressure heating extraction steam, and the remaining steam is supplemented into the flow to do work. The third is the "rated steam extraction minimum electrical load" working condition. At this time, the supplementary steam valve 4 is closed, and the main steam in the high-pressure cylinder 1 is directly used for heating extraction.

[0024] In the high-pressure steam extraction assembly of the present embodiment, the ultra-high-pressure steam extraction port 5 is located on the three-way joint 3, and the three-way joint 3 is set 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 joint 3 can mix and extract the high-temperature steam in the steam supplementary valve 4 with the steam after work in the cylinder, thereby adjusting the temperature and pressure of the steam to meet the use standards of the industrial park, and there is no need to reduce temperature and pressure, thereby avoiding heat waste and reducing coal consumption.

[0025] Specific implementation method 2: Combination Figure 1 , Figure 2This embodiment is described. The difference between this embodiment and the specific embodiment one is that the supplementary steam valve 4 and the main steam valve of the steam turbine unit are an integrated structure. The supplementary steam valve 4 and the main steam valve are integrated together to form a more compact and efficient structure. The design of this integrated structure can reduce the loss during the steam flow process and improve the overall efficiency of the steam turbine. The main steam valve provides main steam to the high-pressure cylinder 1, and the main steam performs work in the high-pressure cylinder 1. The supplementary steam position of the supplementary steam valve 4 is at the fifth level of the high-pressure cylinder 1. The steam temperature in the high-pressure cylinder 1 here has dropped because it has already performed work, which is most in line with the use standards of industrial parks. Of course, the above description is not restrictive. As an alternative embodiment, the supplementary steam valve 4 and the main steam valve can also be a split structure. Other components and connection relationships are the same as those in the specific embodiment one.

[0026] Specific implementation method three: Combination Figures 1 to 4 This embodiment is described. This embodiment also provides an ultra-supercritical adjustable steam extraction steam turbine, including: a first intermediate pressure cylinder 6, a second intermediate pressure cylinder 12, a low pressure cylinder 7 and the above-mentioned high pressure steam extraction assembly. The first intermediate pressure cylinder 6 has a high pressure steam extraction port and a low pressure steam extraction port 8. When performing ultra-high pressure steam extraction, there is no need to reduce temperature and pressure, which reduces energy waste and has lower use cost. Other components and connection relationships are the same as any one of the specific embodiments one or two.

[0027] Specific implementation method four: Combination Figure 1 This embodiment is described. The difference between this embodiment and the third embodiment is that the exhaust port or the steam inlet of the first intermediate pressure cylinder 6 is connected to the boiler reheater, and the high-pressure steam extraction port is arranged in the middle section of the boiler reheater. The steam extraction here can ensure that the heating pressure and the heating amount meet the requirements, and the feasibility is high. The other components and connection relationships are the same as those of the third embodiment.

[0028] Specific implementation method five: Combination Figure 4 This embodiment is described. The difference between this embodiment and the fourth embodiment is that the middle regulating valve 9 is respectively provided on both sides of the first intermediate pressure cylinder 6. The high-pressure steam extraction parameters are adjusted by the middle regulating valve 9. When low-load steam extraction is performed, the middle regulating valve is required to participate in the adjustment. The steam flow is adjusted by the valve structure. The valve structure is not prone to metal deformation and will not affect the overall workmanship. Other components and connection relationships are the same as those of the fourth embodiment.

[0029] Specific implementation method six: Combination Figure 4The present embodiment is described. The present embodiment is different from the specific embodiment 5 in that the four central regulating valves 9 are symmetrically arranged. The four central regulating valves 9 are silencer hole type valves. The silencer hole structure can make the valve work reliably under the conditions of large pressure difference, small flow and small opening, and can accurately adjust the steam flow to meet the specified regulation capacity requirements. The operating principle of the central regulating valve 9 is as follows: 1. When starting to increase the load, the four regulating valves participate in the regulation at the same time. 2. When extracting steam under large load, if the extraction pressure requirement can be met without adjustment, the four central regulating valves are used. 9 are not adjusted. Third, when the load is reduced and steam is extracted, when the load is reduced, in order to ensure the steam extraction pressure, the four middle regulating valves 9 need to be closed at the same time, first close the orifice valve and then close the small cut-off valve, until the cut-off valve opening reaches 15% of the full stroke, maintain the pressure before the valve to switch the valve until the cut-off valve is completely closed, and all subsequent adjustment work is completed by the orifice valve. Fourth, when the load increases, if the load increases during the steam extraction process, it is necessary to first open the large orifice valve to complete the load change. If the load continues to increase, open the large cut-off valve, and close the small orifice valve during the opening of the large cut-off valve. The other components and connection relationships are the same as those of the specific implementation method five.

[0030] Specific implementation method seven: Combination Figure 2 This embodiment is described. The difference between this embodiment and the specific embodiment 3 is that the first intermediate pressure cylinder 6 and the second intermediate pressure cylinder are connected through the delivery pipeline 10, the low-pressure steam extraction port 8 is arranged on the delivery pipeline 10, and there are two bearings after the intermediate pressure tenth stage, each bearing corresponds to a rotor, the deflection is reduced, and the rotor stability is better. The other components and connection relationships are the same as those of the specific embodiment 3.

[0031] Specific implementation method eight: Combination Figures 1 to 4 This embodiment is described. The difference between this embodiment and the seventh embodiment is that a steam extraction butterfly valve 11 is provided at the low-pressure steam extraction port 8 of the delivery pipeline 10. The low-pressure steam extraction parameters are adjusted by the steam extraction butterfly valve 11. The steam extraction butterfly valve 11 is not easy to deform during use, and there will be no jamming, etc., and the use effect is better. The other components and connection relationships are the same as those of the seventh embodiment.

[0032] Working principle of this implementation:

[0033] When performing ultra-high pressure steam extraction, if it is in the working condition of "maximum electrical load of rated steam extraction", the supplementary steam valve 4 is opened at this time to mix the supplementary steam with the steam to increase its temperature and meet the steam extraction temperature requirement. If it is in the working condition of maximum steam extraction, the supplementary steam valve 4 is opened at this time, and the steam from the supplementary steam valve 4 is preferentially supplied to ultra-high pressure heating extraction steam, and the remaining steam is supplemented to flow and do work. If it is in the working condition of "minimum electrical load of rated steam extraction", the supplementary steam valve 4 is closed at this time, and the main steam in the high pressure cylinder 1 is directly used for heating extraction. The high pressure extraction steam and the low pressure extraction steam can be adjusted by means of valves.

[0034] The content of the present invention is not limited to the content of the above-mentioned embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

Claims

1. A high-pressure steam extraction assembly, comprising: A high-pressure cylinder (1), a steam supplement pipeline (2) and a three-way joint (3), wherein steam supplement valves (4) are arranged on both sides of the high-pressure cylinder (1), the steam supplement valve (4) is used to supplement steam to the high-pressure cylinder (1), and the steam supplement pipeline (2) is arranged between the high-pressure cylinder (1) and the steam supplement valve (4); The invention is characterized in that one end of the supplementary steam pipeline (2) is connected to the supplementary steam valve (4), and the other end of the supplementary steam pipeline (2) is connected to the high-pressure cylinder (1) through the three-way joint (3), and the three-way joint (3) is arranged after the high-pressure flow of the high-pressure cylinder (1) reaches five stages, and the three-way joint (3) has an ultra-high-pressure steam extraction port (5).

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

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

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

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

6. The ultra-supercritical adjustable extraction steam turbine according to claim 5, characterized in that: The central regulating valves (9) are four symmetrically arranged, and the four central regulating valves (9) are silencer hole 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 via a delivery pipeline (10), and the low-pressure steam extraction port (8) is arranged on the delivery pipeline (10).

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

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