Double-pipe type main steam temperature and pressure balancing device

Abstract

The utility model discloses a double-pipe type main steam temperature and pressure balancing device, which belongs to the technical field of thermal power and comprises two L-shaped pipes which are horizontally and oppositely arranged, and shunting balancing pipes which are arranged below the opposite ends of the two L-shaped pipes in a matched manner, and the opposite ends of the two L-shaped pipes are staggered front and back; the flow dividing balance pipe comprises two flow dividing bent pipes and two flow dividing vertical pipes which are correspondingly arranged, the opposite ends of one L-shaped pipe are connected with steam inlets in the left side and the right side of the steam turbine through the two flow dividing vertical pipes respectively, and the other end of the L-shaped pipe is connected with a steam outlet in one side of the boiler. The opposite end of the other L-shaped pipe is connected with pipe bodies of the two diversion vertical pipes through the two diversion bent pipes, and the other end of the other L-shaped pipe is connected with a steam outlet in the other side of the boiler. Effective temperature and pressure balance can be carried out on steam at outlets on the two sides of the boiler, temperature and pressure deviation caused by non-uniform heating of the two sides of the boiler is reduced, uniformity of steam parameters of an inlet of a steam turbine is ensured, and operation safety and power generation efficiency of the steam turbine are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power generation, and in particular relates to a double-tube main steam temperature and pressure balancing device. Background Art

[0002] With the growing global demand for energy and increasing emphasis on environmental protection, ultra-supercritical power generation technology has garnered widespread attention for its high efficiency and low carbon emissions. Ultra-supercritical units are generators used in thermal power plants whose main steam parameters exceed the critical point. Ultra-supercritical units of 660MW and above, in particular, have become the mainstream choice for new thermal power generation due to their significantly improved power generation efficiency and reduced greenhouse gas emissions. The core advantage of ultra-supercritical power generation technology lies in its ability to use higher steam parameters, thereby improving thermal efficiency. In ultra-supercritical units of 660MW and above, main steam pressures can reach 31 MPa and temperatures can reach 630°C, significantly improving thermal efficiency while significantly reducing carbon dioxide emissions per unit of electricity.

[0003] The main steam pipe between the boiler and the steam turbine in a conventional unit usually adopts a single steam pipe layout. However, since the main steam parameters of the ultra-supercritical unit far exceed those of the conventional unit, the pipe wall thickness of the single-pipe layout exceeds the maximum value allowed by the industry specification, which not only increases the cost of materials but also brings problems with the safety of the pipe. Therefore, in order to solve the above technical problems, the main steam pipe of the ultra-supercritical unit usually adopts a double steam pipe layout. However, although the double-pipe layout solves the problem of pipe wall thickness, new challenges also arise. In the double-pipe layout, due to the uneven heating on both sides of the boiler, there are certain deviations in the steam temperature and pressure at the outlet of both sides of the boiler, which leads to different resistances of the two steam pipes. This resistance difference will affect the steam pressure at the inlets on both sides of the turbine, thereby adversely affecting the operation of the turbine, reducing the efficiency of the turbine and affecting its safety.

[0004] Therefore, a double-tube main steam temperature and pressure balancing device is needed that can effectively balance the steam temperature and pressure at the outlets on both sides of the boiler and ensure the uniformity of steam parameters at the inlets on both sides of the turbine. Utility Model Content

[0005] The purpose of this utility model is to provide a double-tube main steam temperature and pressure balancing device, which can effectively balance the temperature and pressure of the steam at the outlet of both sides of the boiler, reduce the temperature and pressure deviation caused by uneven heating on both sides of the boiler, ensure the uniformity of steam parameters at the inlet of both sides of the turbine, and improve the operating safety and overall power generation efficiency of the turbine.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0007] A double-tube main steam temperature and pressure balancing device comprises two L-shaped tubes arranged horizontally opposite to each other, with their opposite ends staggered front and back, and a shunt balancing tube arranged below the opposite ends of the two L-shaped tubes; the shunt balancing tube comprises two correspondingly arranged shunt elbows and two shunt risers, wherein the opposite ends of one L-shaped tube are respectively connected to the steam inlets on the left and right sides of the steam turbine through the two shunt risers, and the other end is connected to the steam outlet on one side of the boiler; the opposite end of the other L-shaped tube is respectively connected to the tube bodies of the two shunt risers through the two shunt elbows, and the other end is connected to the steam outlet on the other side of the boiler.

[0008] A further improvement of the technical solution of the present utility model is that the two branching risers or the two branching elbows are respectively connected to the pipe bodies and ends of the opposite ends of their corresponding L-shaped pipes.

[0009] A further improvement of the technical solution of the present utility model is that the diversion elbow includes a vertical pipe and an inclined pipe whose one end is connected to the L-shaped pipe through the vertical pipe and the other end is connected to the diversion riser pipe body. The inclined pipe is arranged to be inclined downward, and the angle between it and the diversion riser is between 30° and 60°.

[0010] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0011] The double-tube main steam temperature and pressure balancing device of the utility model can effectively balance the temperature and pressure of the steam at the outlet of both sides of the boiler, reduce the temperature and pressure deviation caused by uneven heating on both sides of the boiler, ensure the uniformity of the steam parameters at the inlet of both sides of the turbine, and improve the operating safety and overall power generation efficiency of the turbine.

[0012] The utility model adopts two L-shaped tubes arranged horizontally opposite to each other, with their opposite ends staggered front and back, and a diversion balance tube arranged below the opposite ends of the two L-shaped tubes; the diversion balance tube includes two corresponding diversion elbows and two diversion risers, wherein the opposite ends of one L-shaped tube are respectively connected to the steam inlets on the left and right sides of the steam turbine through the two diversion risers, and the other end is connected to the steam outlet on one side of the boiler; the opposite ends of the other L-shaped tube are respectively connected to the pipe bodies of the two diversion risers through the two diversion elbows, and the other end is connected to the steam outlet on the other side of the boiler. The steam on both sides of the boiler can enter the two L-shaped tubes respectively, the steam in one L-shaped tube is divided into two paths in the two diversion risers, and the steam in the other L-shaped tube is divided into two paths in the two diversion elbows and enters the two diversion risers respectively to mix with the steam inside the two, and finally the mixed steam enters the two sides of the steam turbine respectively through the two diversion risers. After the steam on both sides of the boiler is diverted and balanced, the steam flow is redistributed and matched with the resistance of the downstream diverter balancing pipe, effectively balancing the pressure difference of the pipes on both sides. Even when the temperature and pressure deviations on both sides of the boiler are too large, the parameters of the steam transmitted by the two diverter risers can be guaranteed to be basically the same, greatly reducing the deviation of the steam on both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the double-tube main steam temperature and pressure balancing device of the utility model;

[0014] Among them, 1. L-shaped pipe, 2. diversion riser, 3. diversion elbow. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below with reference to the embodiments:

[0016] like Figure 1 As shown, the utility model provides a double-tube main steam temperature and pressure balance device, including two L-shaped tubes 1 and a diversion balance tube that cooperate with each other. The two L-shaped tubes 1 are arranged horizontally relative to each other and their opposite ends are staggered front and back, that is, the two L-shaped tubes 1 are arranged horizontally and are opposite to each other and face opposite directions, but the opposite ends of the two L-shaped tubes 1 do not touch each other, but are staggered front and back with a certain gap between the opposite ends. The diversion balance tube is arranged below the opposite ends of the two L-shaped tubes 1, and includes two corresponding diversion bends 3 and two diversion risers 2, that is, the two diversion bends 3 and the two diversion risers 2 correspond to each other in pairs, and the diversion risers 2 are arranged vertically, the opposite ends of one L-shaped tube 1 are connected to the steam inlets on the left and right sides of the turbine through the two diversion risers 2, and the other end is connected to the steam outlet on one side of the boiler; the opposite end of the other L-shaped tube 1 is connected to the pipe body of the two diversion risers 2 through the two diversion bends 3, and the other end is connected to the steam outlet on the other side of the boiler.

[0017] Specifically, the two branching risers 2 or the two branching elbows 3 are respectively connected to the tube body and end portion of the corresponding L-shaped tube 1 at the opposite ends, that is, the two branching risers 2 are respectively located at the tube body and end portion of the corresponding L-shaped tube 1 at the opposite ends, and similarly, the two branching elbows 3 are also respectively located at the tube body and end portion of the corresponding L-shaped tube 1 at the opposite ends. Since the opposite ends of the two L-shaped tubes 1 are staggered front and back, the branching elbow 3 located at the tube end is connected to the branching riser 2 located at the tube body, and the branching elbow 3 located at the tube body is connected to the branching riser 2 located at the tube end. The branching elbow 3 includes a vertical tube and an inclined tube. The vertical tube is connected to the L-shaped tube 1. One end of the inclined tube is connected to the L-shaped tube 1 through the vertical tube, and the other end is connected to the tube body of the branching riser 2. The inclined tube is tilted downward, and the angle between it and the branching riser 2 is between 30° and 60°. Preferably, the angle between the inclined tube and the branching riser 2 is 45°.

[0018] During operation, the steam on both sides of the boiler enters the two L-shaped tubes 1 respectively. The steam in one L-shaped tube 1 is split into two paths in the two branch risers 2, and the steam in the other L-shaped tube 1 is split into two paths in the two branch bends 3 and enters the two branch risers 2 respectively to mix with the steam inside the two. Finally, the mixed steam enters the two sides of the steam turbine through the two branch risers 2. After the steam on both sides of the boiler is split and balanced, the steam flow is redistributed and matched with the resistance of the downstream split balance pipe, effectively balancing the pressure difference of the pipes on both sides. After the steam on both sides of the boiler is split and balanced, the flow ratio of the steam on both sides allocated to the two branch risers 2 is roughly the same. Even if the temperature deviation on both sides of the boiler is too large, the parameters of the steam transmitted by the two branch risers 2 can be basically the same, greatly reducing the deviation of the steam on both sides.

[0019] The utility model can effectively balance the temperature and pressure of the steam at the outlets on both sides of the boiler, reduce the temperature and pressure deviation caused by uneven heating on both sides of the boiler, ensure the uniformity of the steam parameters at the inlets on both sides of the turbine, and improve the operating safety and overall power generation efficiency of the turbine.

[0020] It is understood that the present invention is described by way of certain embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Furthermore, under the guidance of the present invention, these features and embodiments may be modified to suit specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A double-tube main steam temperature and pressure balance device, characterized by: The invention comprises two L-shaped tubes (1) arranged horizontally opposite to each other, with their opposite ends interlaced front and back, and a flow balancing tube arranged below the opposite ends of the two L-shaped tubes (1); the flow balancing tube comprises two correspondingly arranged flow balancing elbows (3) and two flow balancing vertical tubes (2), wherein the opposite ends of one L-shaped tube (1) are respectively connected to the steam inlets on the left and right sides of the steam turbine through the two flow balancing vertical tubes (2), and the other end thereof is connected to the steam outlet on one side of the boiler; the opposite ends of the other L-shaped tube (1) are respectively connected to the pipe bodies of the two flow balancing vertical tubes (2) through the two flow balancing elbows (3), and the other end thereof is connected to the steam outlet on the other side of the boiler.

2. A double-tube main steam temperature and pressure balance device according to claim 1, characterized in that: The two branching risers (2) or the two branching elbows (3) are respectively connected to the pipe body and the end portion at the opposite ends of their corresponding L-shaped pipes (1).

3. A double-tube main steam temperature and pressure balance device according to claim 2, characterized in that: The diversion elbow (3) comprises a vertical pipe and an inclined pipe whose one end is connected to the L-shaped pipe (1) through the vertical pipe and the other end is connected to the pipe body of the diversion riser (2). The inclined pipe is arranged to be inclined downward, and the angle between it and the diversion riser (2) is between 30° and 60°.

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