Steam turbine generator steam extraction and feedwater system

Abstract

This utility model relates to the field of power engineering technology and discloses a steam extraction and feedwater system for a steam turbine generator. The deaerator and heater are equipped with an adjustment mechanism, which includes a connecting mechanism. The adjustment mechanism comprises a feedwater pump and a diversion pipe. The feedwater pump is fixedly connected to the top of the base, and a pipe is fixedly connected to the top of the feedwater pump. A second feedwater pipe is fixedly connected between the feedwater pump and the deaerator. A valve is fixedly connected to the steam extraction pipe. This steam extraction and feedwater system for a steam turbine generator uses steam extraction for regenerative heating, significantly increasing the feedwater temperature entering the boiler, reducing boiler fuel consumption, effectively improving unit thermal efficiency, and achieving efficient energy utilization. Utilizing steam extraction to drive auxiliary equipment allows for rational energy allocation and reduces overall energy consumption. The deaerator removes dissolved oxygen from the feedwater, protecting pipes and equipment and extending their service life. The feedwater pump is equipped with a speed regulating device to control the feedwater flow rate.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, specifically to a steam extraction and water supply system for a steam turbine generator. Background Technology

[0002] In the energy sector, steam turbine generators, as key equipment in power generation, have always been a focus of attention regarding their operational efficiency and stability. Early steam turbine generators had relatively simple steam extraction and feedwater systems. In terms of steam extraction, the means of adjusting the extraction volume and parameters were limited, making it difficult to accurately adapt to the needs of different turbine loads and various complex operating conditions. This resulted in the insufficient and inefficient utilization of steam energy, with some steam energy being wasted, leading to low overall thermal efficiency of the unit.

[0003] With the continuous growth of energy demand and the increasing requirements for energy conservation and emission reduction, the power industry urgently needs a more efficient, stable and energy-saving steam turbine generator steam extraction and feedwater system to meet the high-quality power supply needs of modern industrial production and social life. Against this background, new steam turbine generator steam extraction and feedwater systems have emerged and are constantly being developed and improved. Utility Model Content

[0004] The purpose of this invention is to provide a steam extraction and feedwater system for a steam turbine generator to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a steam extraction and feedwater system for a steam turbine generator, including a base, a deaerator, and a heater, wherein the deaerator and the heater are provided with an adjustment mechanism, and the adjustment mechanism is provided with a connecting mechanism;

[0006] The regulating mechanism includes a water supply pump and a diversion pipe. The diversion pipe is located on the top of the heater. The water supply pump is fixedly connected to the top of the base. A pipe is fixedly connected to the top of the water supply pump. A second water supply pipe is fixedly connected between the water supply pump and the deaerator. A first water supply pipe is provided on the deaerator, the heater, and the diversion pipe. A steam extraction pipe is provided on the right side of the diversion pipe. A valve is fixedly connected to the steam extraction pipe.

[0007] Preferably, the connecting mechanism includes a connecting seat, which is fixedly connected to the left and right sides of the diversion pipe. The inner rings of the left and right sides of the diversion pipe are provided with internal threads, and the surfaces of the first water supply pipe and the steam extraction pipe are provided with external threads. The external threads are connected to the internal threads. The surfaces of the steam extraction pipe and the first water supply pipe are fixedly connected with connecting rings. The outer rings of the connecting rings are provided with T-grooves. The outer rings of the left and right connecting rings are densely fixedly connected with sliding rods. The T-grooves are slidably connected with T-plates. The outer sides of the T-plates are fixedly connected with insert plates. The outer sides of the connecting seats on the left and right sides are provided with slots. The insert plates and connecting seats are internally connected with bolts. The side of the insert plate away from the connecting seat is fixedly connected with a fixing plate. The inner side of the fixing plate is fixedly connected with a sliding plate.

[0008] Preferably, the slot is set with an opening on the side near the connecting ring, the surface of the insert plate is inserted into the inside of the slot, the insert plate is removed from the slot, and then the steam extraction pipe can be moved, which facilitates regular maintenance of the steam extraction pipe or the first water supply pipe.

[0009] Preferably, the slide plate is located on the side of the connecting ring away from the diverter pipe, and the interior of the slide plate and the surface of the slide rod are slidably connected.

[0010] Preferably, the number of T-slots is eight, and four are grouped together, with the sliding rods disposed on both sides of the T-slots.

[0011] Preferably, the number of insert plates and T-shaped plates are eight, and four are grouped together, with the four T-shaped plates disposed inside the four insert plates.

[0012] Compared with the prior art, the present invention provides a steam extraction and feedwater system for a steam turbine generator, which has the following advantages:

[0013] 1. The steam extraction and feedwater system of this steam turbine generator, through a regulating mechanism, uses steam extraction for regenerative heating, significantly increasing the feedwater temperature entering the boiler, reducing boiler fuel consumption, effectively improving unit thermal efficiency, and achieving efficient energy utilization. Utilizing steam extraction to drive auxiliary equipment rationally allocates energy, reducing overall energy consumption. The deaerator removes dissolved oxygen from the feedwater, protecting pipelines and equipment and extending their service life. The feedwater pump is equipped with a speed regulating device to control the feedwater flow rate to meet different operating conditions. Multiple protection and control devices in the system ensure safe and stable operation under various operating conditions, improving system reliability, reducing the probability of failure, and guaranteeing the continuous and efficient operation of the steam turbine generator system.

[0014] 2. The steam extraction and feedwater system of this steam turbine generator, through the connecting mechanism, after the bolt threads are removed, pushes the insert plate to drive the T-shaped plate to slide in the T-slot. At the same time, the insert plate can also drive the fixed plate, and the fixed plate drives the slide plate to slide on the surface of the slide rod until the insert plate is removed from the slot. Then the steam extraction pipe can be moved to make the external and internal threads rotate, which facilitates the regular maintenance of the steam extraction pipe or the first feedwater pipe. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the adjustment mechanism;

[0018] Figure 3 This is a schematic diagram of the connecting mechanism;

[0019] Figure 4 for Figure 3 A schematic diagram of the structure of the cut-off portion.

[0020] In the diagram: 1. Base; 2. Deaerator; 3. Heater; 4. Connecting mechanism; 41. Connecting seat; 42. Bolt; 43. Slot; 44. Insert plate; 45. T-plate; 46. T-slot; 47. Slide plate; 48. Slide rod; 49. Connecting ring; 401. Fixing plate; 402. External thread; 403. Internal thread; 5. Adjusting mechanism; 51. Steam extraction pipe; 52. Valve; 53. Diverter pipe; 54. First water supply pipe; 55. Second water supply pipe; 56. Pipe; 57. Water pump. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] This utility model provides the following technical solution:

[0024] Example 1

[0025] Combination Figures 1 to 2 The steam extraction and feedwater system of the steam turbine generator includes a base 1, a deaerator 2 and a heater 3. The deaerator 2 and the heater 3 are equipped with an adjustment mechanism 5, and the adjustment mechanism 5 is equipped with a connection mechanism 4.

[0026] The regulating mechanism 5 includes a water supply pump 57 and a diversion pipe 53. The diversion pipe 53 is located on the top of the heater 3. The water supply pump 57 is fixedly connected to the top of the base 1. A pipe 56 is fixedly connected to the top of the water supply pump 57. A second water supply pipe 55 is fixedly connected between the water supply pump 57 and the deaerator 2. A first water supply pipe 54 is provided on the deaerator 2, the heater 3 and the diversion pipe 53. A steam extraction pipe 51 is provided on the right side of the diversion pipe 53. A valve 52 is fixedly connected to the steam extraction pipe 51.

[0027] Furthermore, by using steam extraction for regenerative heating, the feedwater temperature entering the boiler is significantly increased, reducing boiler fuel consumption and effectively improving unit thermal efficiency, achieving efficient energy utilization. Utilizing steam extraction to drive auxiliary equipment allows for rational energy allocation and reduces overall energy consumption. The deaerator removes dissolved oxygen from the feedwater, protecting pipelines and equipment and extending their service life. The feedwater pump is equipped with a speed regulating device to control the feedwater flow rate and meet the needs of different operating conditions. Multiple protection and control devices in the system ensure safe and stable operation under various operating conditions, improve system reliability, reduce the probability of failure, and guarantee the continuous and efficient operation of the turbine generator system.

[0028] Example 2

[0029] See Figure 1-4Furthermore, based on Embodiment 1, the connecting mechanism 4 includes a connecting seat 41, which is fixedly connected to the left and right sides of the diversion pipe 53. The inner rings of the left and right sides of the diversion pipe 53 are provided with internal threads 403. The surfaces of the first water supply pipe 54 and the steam extraction pipe 51 are provided with external threads 402. The surface of the external threads 402 and the internal threads 403 are connected by internal threads. The surfaces of the steam extraction pipe 51 and the first water supply pipe 54 are fixedly connected with connecting rings 49. The outer rings of the connecting rings 49 are provided with T-grooves 46. The outer rings of the left and right connecting rings 49 are densely fixedly connected with sliding rods 48. The T-grooves 46 are slidably connected with T-plates 45. The outer rings of the T-plates 45 are fixedly connected with insert plates 44. The outer rings of the left and right connecting seats 41 are provided with slots 43. The insert plates 44 and the connecting seats 41 are threadedly connected with bolts 42. The side of the insert plates 44 away from the connecting seats 41 is fixedly connected with a fixing plate 401. The inner side of the fixing plate 401 is fixedly connected with a sliding plate 47.

[0030] The slot 43 is open on the side near the connecting ring 49. The surface of the insert plate 44 is inserted into the slot 43. The slide plate 47 is located on the side of the connecting ring 49 away from the diversion pipe 53. The interior of the slide plate 47 is slidably connected to the surface of the slide rod 48. There are eight T-slots 46 in groups of four. The slide rod 48 is located on both sides of the T-slots 46. There are eight insert plates 44 and eight T-plates 45 in groups of four. The four T-plates 45 are located inside the four insert plates 44.

[0031] Furthermore, after the bolt 42 is removed, the insert plate 44 is pushed to drive the T-shaped plate 45 to slide in the T-shaped groove 46. At the same time, the insert plate 44 can also drive the fixing plate 401. The fixing plate 401 drives the sliding plate 47 to slide on the surface of the sliding rod 48 until the insert plate 44 is removed from the slot 43. Then the steam extraction pipe 51 can be moved to make the external thread 402 and the internal thread 403 rotate, which facilitates the regular maintenance of the steam extraction pipe 51 or the first water supply pipe 54.

[0032] In actual operation, when this device is used, steam is generated from the boiler and has high pressure and high temperature. It enters the steam turbine. The steam turbine usually has multiple stages of blades. As the steam expands and does work at each stage, the pressure and temperature gradually decrease. There are extraction ports between different stages of the steam turbine. According to the system requirements, some steam will be extracted from these extraction ports.

[0033] To ensure the safe and stable operation of the steam turbine and meet the steam extraction requirements under different operating conditions, the steam extraction system is equipped with a complete set of adjustment and control devices. Valves are installed on the steam extraction pipeline, and the steam extraction flow rate is controlled by the valve opening. The valve action is automatically controlled by the control system based on parameters such as the turbine load, feedwater temperature, and water level of each heater.

[0034] The function of a deaerator is to remove dissolved oxygen and other non-condensable gases from the feed water. Its working principle is based on Henry's Law, which states that at a certain temperature, the solubility of a gas in water is directly proportional to the partial pressure of that gas on the water surface. The deaerator heats the water to its boiling point by introducing steam into it. At this point, the solubility of dissolved oxygen and other gases in the water decreases, and they escape from the water.

[0035] The feedwater pump draws water from the deaerator tank. Its main function is to pressurize the deaerated water to the pressure required by the boiler. The feedwater pump is usually a centrifugal pump. The high-speed rotation of the impeller gives the water centrifugal force, thereby increasing the water pressure.

[0036] After being pressurized by the feedwater pump, the water enters the heater. In the heater, the feedwater is heated by the steam extracted from the turbine, further increasing the feedwater temperature. The heater generally adopts a shell-and-tube structure, with the feedwater flowing inside the tubes and the extracted steam condensing and releasing heat outside the tubes. After being heated by the heater, the feedwater temperature rises significantly, and then it enters the economizer of the boiler. The economizer is an important component of the boiler. It uses the waste heat of the flue gas at the tail end of the boiler to reheat the feedwater, improving the boiler's thermal efficiency. Finally, the fully heated and pressurized feedwater enters the boiler drum and participates in the steam-water circulation within the boiler, providing a water source for steam generation.

[0037] After the bolt 42 is removed, the insert plate 44 is pushed to move the T-shaped plate 45 in the T-slot 46. At the same time, the insert plate 44 can also move the fixing plate 401. The fixing plate 401 moves the sliding plate 47 on the surface of the sliding rod 48 until the insert plate 44 is removed from the slot 43. Then the steam extraction pipe 51 can be moved to rotate the external thread 402 and the internal thread 403, which facilitates the regular maintenance of the steam extraction pipe 51 or the first water supply pipe 54.

[0038] 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.

Claims

1. A steam extraction and feedwater system for a steam turbine generator, comprising a base (1), a deaerator (2), and a heater (3), characterized in that: The deaerator (2) and heater (3) are provided with adjustment mechanisms (5), and the adjustment mechanisms (5) are provided with connecting mechanisms (4). The regulating mechanism (5) includes a water pump (57) and a diversion pipe (53). The diversion pipe (53) is located on the top of the heater (3). The water pump (57) is fixedly connected to the top of the base (1). A pipe (56) is fixedly connected to the top of the water pump (57). A second water supply pipe (55) is fixedly connected between the water pump (57) and the deaerator (2). A first water supply pipe (54) is provided on the deaerator (2), the heater (3), and the diversion pipe (53). A steam extraction pipe (51) is provided on the right side of the diversion pipe (53). A valve (52) is fixedly connected to the steam extraction pipe (51).

2. The steam extraction and feedwater system for a steam turbine generator according to claim 1, characterized in that: The connecting mechanism (4) includes a connecting seat (41), which is fixedly connected to the left and right sides of the diversion pipe (53). The inner rings of the left and right sides of the diversion pipe (53) are provided with internal threads (403). The surfaces of the first water supply pipe (54) and the steam extraction pipe (51) are provided with external threads (402). The surface of the external thread (402) is connected to the internal thread (403). The surfaces of the steam extraction pipe (51) and the first water supply pipe (54) are fixedly connected with connecting rings (49). The outer ring of the connecting ring (49) is provided with T-shaped openings around its perimeter. The T-groove (46) has sliding rods (48) densely fixed around the outer periphery of the two connecting rings (49) on the left and right sides. The T-groove (46) has a T-plate (45) slidably connected inside. The T-plate (45) has a plug plate (44) fixedly connected to the outside. The connecting seats (41) on the left and right sides have slots (43) on the outside. The plug plate (44) and the connecting seat (41) are threaded with bolts (42). The plug plate (44) is fixedly connected to a fixing plate (401) on the side away from the connecting seat (41). The fixing plate (401) has a sliding plate (47) fixedly connected to the inside.

3. The steam extraction and feedwater system for a steam turbine generator according to claim 2, characterized in that: The slot (43) is set to be open on the side near the connecting ring (49), and the surface of the insert plate (44) is inserted into the slot (43).

4. The steam extraction and feedwater system for a steam turbine generator according to claim 2, characterized in that: The slide plate (47) is located on the side of the connecting ring (49) away from the diversion pipe (53), and the interior of the slide plate (47) is slidably connected to the surface of the slide rod (48).

5. The steam extraction and feedwater system for a steam turbine generator according to claim 2, characterized in that: The number of T-slots (46) is eight, and four are grouped together. The slide rods (48) are arranged on both sides of the T-slots (46).

6. The steam extraction and feedwater system for a steam turbine generator according to claim 2, characterized in that: The number of the insert plate (44) and the T-shaped plate (45) are eight and four are grouped together, with the four T-shaped plates (45) disposed inside the four insert plates (44).

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