Online flushing water ring device for double-flange liquid level meter of steam turbine surface air cooler

Abstract

The utility model discloses an online flushing water ring device for a double-flange liquid level meter of a steam turbine surface cooler, which comprises a flushing water ring arranged at a liquid level meter below two liquid level sensors of the double-flange liquid level meter for detecting low liquid level, and desalted water is introduced into the flushing water ring. And the flushing water ring sprays demineralized water to a liquid level sensing diaphragm of the double-flange liquid level meter for flushing. The flushing water ring controls the supplied demineralized water through a water inlet primary valve. A water inlet secondary valve is arranged at the rear end of the water inlet primary valve in the desalted water supply direction, the water inlet primary valve and the water inlet secondary valve are connected through a water pipe, and a bypass exhaust valve is arranged on the water pipe. By means of the flushing water ring device and the flushing control structure, the problem that the liquid phase pipeline of the double-flange liquid level meter of the surface air cooler is blocked on line under the condition that a steam turbine is not stopped is solved.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine auxiliary equipment technology, and in particular to an online flushing water ring device for a steam turbine surface cooler dual flange level gauge. Background Technology

[0002] When the steam turbine is running, the surface cooler is under negative pressure. After the unit has been running for a long time, rust and debris in the internal pipes and bottom are deposited on the diaphragm of the liquid phase pipe of the double flange level gauge. This causes the level gauge diaphragm to malfunction, resulting in a distorted level gauge display and affecting the operator's judgment.

[0003] like Figure 1 The diagram shows the existing connection of a surface cooler level gauge. Under current technology, when debris accumulates on the diaphragm of the liquid phase pipe in a dual-flange level gauge, to obtain an accurate level display, the turbine must be stopped, the liquid in the surface cooler drained, and the level gauge flange disassembled to clean the debris through the flange opening. This method requires the turbine to be shut down, causing significant production losses. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide an online flushing water ring device for a double-flange level gauge of a steam turbine surface cooler. This addresses issues such as the inability to open the valve of the level gauge's liquid phase pipeline for drainage due to negative pressure inside the surface cooler during steam turbine operation, and display distortion when the liquid phase pipeline of the double-flange level gauge is blocked by debris.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] An online flushing water ring device for a dual-flange level gauge of a steam turbine surface cooler includes a flushing water ring installed at the level gauge below the two level sensors of the dual-flange level gauge that detects low liquid levels. Demineralized water is introduced into the flushing water ring, and the flushing water ring sprays demineralized water onto the level sensing diaphragm of the dual-flange level gauge for flushing.

[0007] The aforementioned flushing water ring is controlled by the primary inlet valve to supply demineralized water.

[0008] The aforementioned primary inlet valve is equipped with a secondary inlet valve at its rear end along the demineralized water supply direction. The primary inlet valve and the secondary inlet valve are connected by a water pipe, and a bypass vent valve is provided on the water pipe.

[0009] The aforementioned flushing water ring includes an annular tube body, on which multiple flushing nozzles facing the liquid level sensing diaphragm are provided. The annular tube body is connected to a liquid supply pipe, which is connected to a secondary inlet valve.

[0010] In the preferred embodiment, the flushing water ring is located inside the surface cooler, and the supply pipe of the flushing water ring extends out of the surface cooler and connects to the inlet secondary valve for supplying liquid.

[0011] In the preferred embodiment, the aforementioned flushing water ring is located outside the surface cooler, the flushing nozzle of the flushing water ring extends into the liquid level flange connection pipe of the surface cooler and is opposite to the liquid level sensing diaphragm, the annular pipe surrounds the outside of the liquid level flange connection pipe of the surface cooler, and the edge of the flushing nozzle is welded and sealed to the liquid level flange connection pipe of the surface cooler.

[0012] The aforementioned surface cooler has a dual-flange level gauge on both the input and output sides, and a flushing water ring is installed at the level gauge that detects the low liquid level.

[0013] This utility model provides an online flushing water ring device for a dual-flange level gauge of a steam turbine surface cooler. By utilizing the flushing water ring device and flushing control structure, it solves the problem of blockage in the liquid phase pipeline of the dual-flange level gauge of the surface cooler without shutting down the steam turbine. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0015] Figure 1 A schematic diagram of an existing dual-flange level gauge for a surface cooler;

[0016] Figure 2 This is a schematic diagram of the online flushing water ring device for the dual-flange level gauge of the surface cooler in this utility model.

[0017] Figure 3 This is a schematic diagram of the flushing water ring structure;

[0018] Figure 4 A schematic diagram of the flushing water ring arrangement for one preferred embodiment;

[0019] Figure 5 This is a schematic diagram of the flushing water ring arrangement for the preferred option two.

[0020] In the diagram: 1. Double flange level gauge, 101. Level gauge flange, 102. Level sensing diaphragm, 2. Flushing water ring, 201. Ring pipe, 202. Flushing nozzle, 203. Supply pipe, 3. Secondary inlet valve, 4. Exhaust valve, 5. Water pipe, 6. Primary inlet valve, 7. Cooler level flange connection pipe. Detailed Implementation

[0021] Example 1:

[0022] like Figure 1-5 As shown, an online flushing water ring device for a dual-flange level gauge of a steam turbine surface cooler includes a flushing water ring 2 installed at the level gauge below the two level sensors of the dual-flange level gauge 1 that detects low liquid level. Demineralized water is introduced into the flushing water ring 2, and the flushing water ring 2 sprays demineralized water onto the level sensing diaphragm 102 of the dual-flange level gauge 1 for flushing.

[0023] The demineralized water required by the steam turbine is used to flush the level sensing diaphragm 102 of the double flange level gauge 1, removing the deposited rust and debris from the sensing diaphragm so that the liquid can be normally conducted to the diaphragm. Since rust and debris always deposit at the low liquid level due to gravity, there is no need to flush the flange of the level gauge at the high liquid level.

[0024] The aforementioned flushing water ring 2 is controlled by the primary inlet valve 6 to supply demineralized water.

[0025] The aforementioned primary inlet valve 6 is provided with a secondary inlet valve 3 at its rear end along the demineralized water supply direction. The primary inlet valve 6 and the secondary inlet valve 3 are connected by a water pipe 5, and a bypass vent valve 4 is provided on the water pipe 5.

[0026] The aforementioned flushing water ring 2 includes an annular tube 201, on which multiple flushing nozzles 202 are provided facing the liquid level sensing diaphragm 102. The annular tube 201 is connected to the liquid supply pipe 203, and the liquid supply pipe 203 is connected to the secondary water inlet valve 3.

[0027] In the preferred embodiment, the flushing water ring 2 is located inside the surface cooler, and the liquid supply pipe 203 of the flushing water ring 2 extends out of the surface cooler and connects to the secondary water inlet valve 3 for liquid supply.

[0028] like Figure 4 As shown, placing the entire flushing water ring 2 inside the surface cooler can effectively clean the diaphragm. However, a bracket for fixing the flushing water ring 2 needs to be installed inside the surface cooler to ensure that the flushing nozzle 202 faces the diaphragm. The liquid supply pipe 203 extends out of the surface cooler for welding. Only one pipe needs to be welded, but the internal flushing water ring can easily obstruct the removal of impurities from the diaphragm.

[0029] In the preferred embodiment, the flushing water ring 2 is located outside the surface cooler. The flushing nozzle 202 of the flushing water ring 2 extends into the liquid level flange connecting pipe 7 of the surface cooler and is opposite to the liquid level sensing diaphragm 102. The annular pipe body 201 surrounds the liquid level flange connecting pipe 7 of the surface cooler, and the edge of the flushing nozzle 202 is welded and sealed to the liquid level flange connecting pipe 7 of the surface cooler.

[0030] like Figure 5 As shown, the flushing water ring 2 is placed outside the surface cooler, and the edge of the flushing nozzle 202 is welded and sealed to the surface cooler liquid level flange connecting pipe 7. In this way, the surface cooler liquid level flange connecting pipe 7 acts as a fixed space. This solution does not require additional support, but there is a lot of welding work and multiple nozzles are needed to ensure the seal. However, since the annular pipe 201 is on the outside, it will not hinder the removal of the flushed debris.

[0031] Each of the above-mentioned surface cooler input and output sides is equipped with a dual-flange level gauge 1, and a flushing water ring 2 is installed at the level gauge of the two dual-flange level gauges 1 that detects low liquid level.

[0032] The flushing water ring is installed between the diaphragm and the blind cover of the liquid phase valve of the double-flanged level gauge. The flushing water ring is equipped with a secondary inlet valve, an vent valve, and a primary inlet valve. A connecting water pipe connects the secondary inlet valve and the primary inlet valve. The primary inlet valve is installed on the demineralized water pipeline. During turbine operation, the surface cooler is under negative pressure. When the liquid phase pipeline of the double-flanged level gauge becomes distorted due to blockage by debris, the primary inlet valve of the flushing water ring on the liquid phase valve of the double-flanged level gauge is opened. Then, the vent valve is opened to purge the air from the pipeline and close it. Finally, the secondary inlet valve is opened to spray water into the surface cooler to flush the liquid phase pipeline. This allows for the debris to be flushed into the inlet filter of the surface cooler condensate pump without shutting down the turbine.

Claims

1. A turbine surface condenser double flange liquid level meter online flushing water ring device, characterized in that, The flushing water ring (2) is installed at the level gauge below the two level sensors of the dual flange level gauge (1) for detecting low liquid level. Demineralized water is introduced into the flushing water ring (2), and the flushing water ring (2) sprays demineralized water onto the level sensing diaphragm (102) of the dual flange level gauge (1) for flushing.

2. A steam turbine surface condenser double flanged liquid level meter on-line flush water ring device according to claim 1, characterized in that, The flushing water ring (2) is controlled by the primary inlet valve (6) to supply demineralized water.

3. A steam turbine surface condenser double flanged liquid level meter on-line flush water ring device according to claim 2, characterized in that, The primary water inlet valve (6) is provided with a secondary water inlet valve (3) at the rear end along the demineralized water supply direction. The primary water inlet valve (6) and the secondary water inlet valve (3) are connected by a water pipe (5), and a bypass air vent valve (4) is provided on the water pipe (5).

4. A steam turbine surface condenser double flanged liquid level meter on-line flush water ring device according to claim 3, characterized in that, The flushing water ring (2) includes an annular tube (201), on which multiple flushing nozzles (202) facing the liquid level sensing diaphragm (102) are provided. The annular tube (201) is connected to the liquid supply pipe (203), and the liquid supply pipe (203) is connected to the secondary water inlet valve (3).

5. A steam turbine surface condenser double flanged liquid level meter online water flush water ring device according to claim 4, characterized in that, The flushing water ring (2) is located inside the surface cooler. The liquid supply pipe (203) of the flushing water ring (2) extends out of the surface cooler and is connected to the secondary water inlet valve (3) for liquid supply.

6. A steam turbine surface condenser double flanged liquid level meter online water flush water ring device according to claim 5, characterized in that, The flushing water ring (2) is located outside the surface cooler. The flushing nozzle (202) of the flushing water ring (2) extends into the liquid level flange connecting pipe (7) of the surface cooler and is opposite to the liquid level sensing diaphragm (102). The annular pipe body (201) surrounds the liquid level flange connecting pipe (7) of the surface cooler. The edge of the flushing nozzle (202) is welded and sealed to the liquid level flange connecting pipe (7) of the surface cooler.

7. A steam turbine surface condenser double flanged liquid level meter online water flush water ring device according to claim 6, characterized in that, The surface cooler is provided with a double flange level gauge (1) on both the input and output sides, and a flushing water ring (2) is provided at the level gauge of the two double flange level gauges (1) that detects low liquid level.

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