A new high-gas extraction device

Abstract

The utility model discloses a novel high pressure heater noncondensable gas device, including the center hole steam extraction pipe, gas guide pipe and steam extraction main pipe that connect gradually, the inside of hole steam extraction pipe, gas guide pipe and steam extraction main pipe form the passage space, and the passage space goes noncondensable gas extraction, and the center hole steam extraction pipe is set up in the U -shaped pipe heat exchange region center in the shell, and the steam extraction main pipe is provided with the plug type throttle orifice plate at the external connection. The novel high pressure heater noncondensable gas device center hole steam extraction pipe is located in the U -shaped pipe heat exchange region center position in the shell, namely noncondensable gas gathering area, greatly reduces the steam volume in the steam extraction, thereby saves a large amount of energy, improves the stability of the steam extraction process through the fixed throttle orifice plate of setting in each gas guide pipe, sets up the plug type throttle orifice plate at the external connection of steam extraction main pipe to adjust the steam extraction volume to the different high pressure heater operating load, avoids unnecessary steam waste.

Description

Technical Field

[0001] This utility model relates to the field of power generation technology, and in particular to a novel high-pressure extraction device for non-condensable gases. Background Technology

[0002] U-tube high-pressure heaters (hereinafter referred to as "U-tube heaters") are important heat exchangers mainly used in large thermal power generating units. Their function is to use part of the steam extracted from the steam turbine to heat the feedwater. The quality of their heat transfer performance directly affects the economy and safety of thermal power generating units.

[0003] Steam extracted from the turbine serves as the heating source and enters the shell side of the U-tube high-pressure heater. To improve the heat transfer efficiency of the U-tube high-pressure heater, the shell-side structure is mostly designed as a steam cooling section, a steam condensation section, and a condensate cooling section, with the steam condensation section having the most concentrated heat exchange load.

[0004] In the steam condensation section, the extracted steam transfers heat to the feedwater and condenses itself into water. Since the non-condensable gases trapped inside the extracted steam cannot condense and are discharged with the water, and also affect the condensation heat transfer of the steam, a non-condensable gas extraction device is needed to remove the non-condensable gases from inside the shell.

[0005] Traditional non-condensable gas extraction devices have their extraction points located on one or both sides of the casing, using multiple openings on the casing to discharge the non-condensable gases. As the steam condensation process shows, the accumulation zone for non-condensable gases is at the center of the piping system, while the traditional extraction point is relatively far from the center. Therefore, while extracting non-condensable gases, a large amount of steam needs to be discharged, significantly reducing the extraction efficiency and resulting in substantial energy waste.

[0006] When the load changes during long-term operation of the high-pressure heater, the traditional non-condensable gas extraction device cannot actively adjust the extraction steam volume, resulting in a mismatch between the exhaust volume and the non-condensable gas volume, which leads to excessive discharge of usable steam and unnecessary steam waste. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model designs a new type of high-pressure gas extraction non-condensable gas device to replace the traditional high-pressure gas extraction non-condensable gas device.

[0008] The present invention adopts the following technical solution:

[0009] A novel high-pressure steam extraction device for non-condensable gases includes a centrally perforated extraction pipe, a guide pipe, and an extraction steam header connected in sequence. The interiors of the centrally perforated extraction pipe, the guide pipe, and the extraction steam header form a channel space in which non-condensable gases are extracted. The centrally perforated extraction pipe is located at the center of the U-shaped tube heat exchange area inside the shell. A plug-type throttling orifice plate is provided at the external connection of the extraction steam header.

[0010] Preferably, the gas guide pipe consists of multiple pipes, which are respectively connected to the centrally opened steam extraction pipe and the steam extraction main pipe.

[0011] Preferably, a fixed throttling orifice plate is provided inside the air guide tube.

[0012] Preferably, the centrally perforated extraction pipe and the extraction header pipe are arranged in parallel.

[0013] Preferably, the multiple air guide pipes are arranged perpendicular to the central opening steam extraction pipe, and the multiple air guide pipes are evenly arranged along the central opening steam extraction pipe.

[0014] The beneficial effects of this utility model are: (1) The central opening extraction pipe of the new U-shaped tube high-pressure heater adjustable central extraction non-condensable gas device is located in the center of the U-shaped tube heat exchange area inside the shell, that is, the non-condensable gas accumulation area, which greatly reduces the amount of steam in the extraction, thereby saving a lot of energy; (2) The stability of the extraction process is improved by setting a fixed throttling orifice plate in each gas guide pipe; (3) A plug-type throttling orifice plate is set at the external connection of the extraction main pipe to adjust the extraction amount according to different high-pressure heater operating loads, avoiding unnecessary steam waste. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the principle of this utility model in normal working mode;

[0017] In the diagram: 1. Centrally orifice extraction pipe; 2. Guide pipe; 3. Extraction main pipe; 4. Fixed orifice plate; 5. Plug type orifice plate. Detailed Implementation

[0018] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0019] Example: Figure 1 and Figure 2 As shown, a novel high-pressure non-condensable gas extraction device includes a centrally perforated extraction pipe 1, a guide pipe 2, and an extraction main pipe 3 connected in sequence. The interiors of the perforated extraction pipe, the guide pipe, and the extraction main pipe form a channel space, in which non-condensable gas is extracted. The centrally perforated extraction pipe is located at the center of the U-shaped tube heat exchange area inside the shell, and a plug-type throttling orifice plate 5 is provided at the external connection of the extraction main pipe.

[0020] There are multiple gas guide pipes, which are connected to the centrally located extraction steam pipe and the extraction steam main pipe respectively. Each gas guide pipe is equipped with a fixed throttling orifice plate 4.

[0021] The centrally located extraction steam pipe and the extraction main pipe are arranged in parallel. Multiple guide pipes are arranged perpendicular to the centrally located extraction steam pipe and are evenly distributed along the centrally located extraction steam pipe.

[0022] Non-condensable gas is collected through the central opening extraction pipe 1 of the U-shaped tube heat exchange area inside the shell. The non-condensable gas is then conducted from the central opening extraction pipe 1 to the external extraction main pipe 3 of the shell through multiple gas guide pipes 2. Finally, it is discharged to the downstream equipment of the process through the plug-type throttling orifice plate 5 set at the external pipe opening of the extraction main pipe.

[0023] This novel U-shaped tube high-pressure heater adjustable center extraction non-condensable gas device has its centrally located extraction pipe at the center of the U-shaped tube heat exchange area inside the shell, i.e., the non-condensable gas accumulation zone. This significantly reduces the amount of steam extracted, thereby saving a large amount of energy. The stability of the extraction process is improved by using fixed orifice plates installed in each gas guide pipe. A plug-type orifice plate is installed at the external connection of the extraction main pipe to adjust the extraction volume according to different high-pressure heater operating loads, avoiding unnecessary steam waste.

[0024] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A novel high-gas-over-liquid non-condensable gas device, characterized in that, It includes a centrally perforated extraction pipe, a guide pipe, and an extraction main pipe connected in sequence. The interior of the extraction pipe, the guide pipe, and the extraction main pipe form a channel space, in which non-condensable gases are extracted. The centrally perforated extraction pipe is located in the center of the U-shaped tube heat exchange area inside the shell. A plug-type throttling orifice plate is provided at the external connection of the extraction main pipe.

2. A novel high-gas-abstracting non-condensable gas device according to claim 1, characterized in that, The gas guide pipe consists of multiple pipes, which are respectively connected to the centrally opened steam extraction pipe and the steam extraction main pipe.

3. A novel high-gas-abstracting non-condensable gas device according to claim 1, characterized in that, A fixed throttling orifice plate is installed inside the air duct.

4. A novel high-gas-abstracting non-condensable gas device according to claim 1, characterized in that, The centrally located extraction pipe and the extraction header are arranged in parallel.

5. A novel high-gas-abstracting non-condensable gas device according to claim 2, characterized in that, The multiple gas guide pipes are arranged perpendicular to the central opening steam extraction pipe, and the multiple gas guide pipes are evenly arranged along the central opening steam extraction pipe.

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