Drain valve ice melting pipeline of indirect air cooling system

Abstract

The utility model relates to an ice melting pipeline for a drain valve of an indirect air cooling system, which is characterized in that a heat exchange tube bundle is connected with a water inlet pipe and a water return pipe, a sector water return valve is arranged on the water inlet pipe, and a sector water inlet valve is arranged on the water return pipe; the sides, away from the heat exchange tube bundle, of the sector water return valve and the sector water inlet valve are communicated through a small bypass, the small bypass is provided with a branch serving as an ice melting pipeline, and the ice melting pipeline is divided into two branches which are connected to a water return branch and a water inlet branch respectively and used for deicing the cold water valve and the hot water valve. The T-shaped ice melting pipeline has the advantages that the T-shaped ice melting pipeline is additionally arranged, the ice melting pipeline is divided into two branches which are connected to the water return branch and the water inlet branch respectively and used for deicing the cold water valve and the hot water valve, and the problem that the operation efficiency of a sector is affected due to freezing of a cold / hot water drain valve when the indirect air cooling circulating water system of a thermal power plant is put into operation in the sector in winter is solved; the hidden danger that the sector is frozen in a large area due to original deicing operation is avoided, and the operation reliability of the indirect cooling sector is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of thermal power plant cooling, especially including an indirect air cooling system drain valve ice melting pipeline. BACKGROUND

[0002] The single sector ice melting pipeline comprises two DN25 ordinary manual stop valves, a 7.5m seamless steel pipe, a tee joint and a flange and the like accessories.

[0003] In the prior art, insulation and electric heat tracing are added at the drain valve to continuously heat the lower part of the drain valve after the winter sector drainage, but this method has the problems of large secondary transformation investment, the need to set a special electric heat tracing cable, high maintenance cost in the later period and no energy saving.

[0004] Therefore, there is an urgent need to design a pipeline structure that reduces equipment damage accidents caused by improper operation of the ice melting valve in the indirect air cooling circulating water system and improves the reliability of the indirect air cooling system. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects in the prior art and provides an indirect air cooling system drain valve ice melting pipeline.

[0006] The indirect air cooling system drain valve ice melting pipeline has a water inlet pipe and a backwater pipe connected to the heat exchange tube bundle, a sector backwater valve is arranged on the water inlet pipe, and a sector water inlet valve is arranged on the backwater pipe; the sector backwater valve and the sector water inlet valve are connected through a small bypass on the side away from the heat exchange tube bundle;

[0007] A backwater branch is arranged between the heat exchange tube bundle and the sector backwater valve, and an inlet water branch is arranged between the heat exchange tube bundle and the sector water inlet valve; a cold water valve is arranged on the backwater branch, and a hot water valve is arranged on the inlet water branch;

[0008] The small bypass has a branch as an ice melting pipeline, and the ice melting pipeline is divided into two branches connected to the backwater branch and the inlet water branch, respectively, for ice melting of the cold water valve and the hot water valve.

[0009] Preferably, a small bypass manual valve is arranged in the small bypass, the medium in the small bypass flows from the water inlet pipe side to the backwater pipe side, and the connection node of the ice melting pipeline and the small bypass is arranged on the upstream side of the small bypass manual valve.

[0010] As preferred, the branch of the ice melting pipeline connected to the return water branch is provided with a cold water trap valve ice melting manual valve, and the branch of the ice melting pipeline connected to the inlet water branch is provided with a hot water trap valve ice melting manual valve; the two branches of the ice melting pipeline are connected to the upstream side of the cold water valve and the hot water valve respectively.

[0011] As preferred, the heat exchange tube bundle is connected to the upstream of the return water pipe, the downstream end of the return water pipe is connected to the cold wall of the self-circulating water pipeline, the upstream of the inlet water pipe is connected to the hot wall of the self-circulating water pipeline, and the downstream of the inlet water pipe is connected to the heat exchange tube bundle; the return water branch and the inlet water branch converge to the underground drain pipeline.

[0012] As preferred, the return water pipe upstream of the small bypass is connected with a cleaning pipe, the cleaning pipe is connected to a cooling triangle cleaning device, and the cleaning pipe is provided with a cleaning pipe manual valve.

[0013] The utility model has the advantages that:

[0014] 1) The utility model discloses an ice melting pipeline with T-shaped structure, which is divided into two branches connected to the return water branch and the inlet water branch respectively, and is used for ice melting of the cold water valve and the hot water valve, thereby solving the problem of freezing of the cold water trap valve and the hot water trap valve during the winter operation of the indirect air cooling circulating water system of the power plant, avoiding the hidden danger of large-area freezing of the sector caused by the original ice melting operation, and improving the reliability of the indirect air cooling sector operation.

[0015] 2) The branch of the ice melting pipeline connected to the return water branch is provided with a cold water trap valve ice melting manual valve, and the branch of the ice melting pipeline connected to the inlet water branch is provided with a hot water trap valve ice melting manual valve, which is convenient to open after the sector drainage in winter, and is used for ice melting operation of the cold water valve and the hot water valve, which is simple and effective, and reduces the equipment damage accidents caused by improper ice melting valve operation of the indirect air cooling circulating water system. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structure diagram of the ice melting pipeline of the indirect air cooling system trap valve.

[0017] Figure 2 It is a structure diagram of the original pipeline of the air cooling system sector system.

[0018] Figure 3 It is a diagram of ice formation downstream of the cold water valve or the hot water valve.

[0019] Mark for explaining: sector return water valve 1, sector inlet water valve 2, small bypass manual valve 3, sector return water pipe exhaust valve 4, sector inlet water pipe exhaust valve 5, cold water valve 6, hot water valve 7, cleaning pipe manual valve 8, heat exchange tube bundle 10, cold wall of self-circulating water pipeline 11, underground drain pipeline 12, hot wall of self-circulating water pipeline 13, cold water trap valve ice melting manual valve 72, hot water trap valve ice melting manual valve 73. DETAILED DESCRIPTION

[0020] The utility model will be further described below in combination with examples. The following examples are only used to help understand the utility model. It should be pointed out that for ordinary people in the technical field, without departing from the principle of the utility model, the utility model can be modified, and these improvements and modifications also fall within the protection scope of the utility model claims.

[0021] As an embodiment, as shown in Figure 1 and Figure 2 The original air cooling system sector system pipeline, Ningxia Jujun Power Plant 2 × 660 MW project steam turbine generator unit is supercritical parameter steam turbine produced by Shanghai steam turbine plant by introducing Siemens technology, and the unit cooling mode is indirect air cooling system, and the system is provided with 10 cooling sectors, as shown in Figure 2 is arranged as a single sector:

[0022] The heat exchange tube bundle 10 is connected with the water inlet pipe and the backwater pipe, specifically, the heat exchange tube bundle 10 is connected upstream of the backwater pipe, and the downstream end of the backwater pipe is connected into the self-circulating water pipe line cold wall 11; the water inlet pipe upstream is connected with the self-circulating water pipe line hot wall 13, and the water inlet pipe downstream is connected with the heat exchange tube bundle 10.

[0023] The sector backwater valve 1 is arranged on the water inlet pipe, and the sector water inlet valve 2 is arranged on the backwater pipe; the circulating water enters the heat exchange tube bundle 10 through the sector water inlet valve 2 and carries out convective heat exchange with air, and the cooled circulating water enters the main cold water pipe line in the self-circulating water pipe line cold wall 11 through the sector backwater valve 1.

[0024] The sector backwater valve 1 and the sector water inlet valve 2 are communicated through a small bypass on the side away from the heat exchange tube bundle 10; a small bypass manual valve 3 is arranged in the small bypass, and the medium in the small bypass flows from the water inlet pipe side to the backwater pipe side.

[0025] The heat exchange tube bundle 10 and the sector backwater valve 1 are provided with a backwater branch, and the heat exchange tube bundle 10 and the sector water inlet valve 2 are provided with a water inlet branch; the backwater branch is provided with a cold water valve 6, and the water inlet branch is provided with a hot water valve 7; the backwater branch and the water inlet branch converge to the underground drainage pipe line 12.

[0026] The backwater pipe upstream of the small bypass is connected with a cleaning pipe, the cleaning pipe is connected to a cooling triangle cleaning device, and a cleaning pipe manual valve is arranged in the cleaning pipe.

[0027] Cold water valve 6 and hot water valve 7 are used for unloading water from the heat exchange tube bundle 10 in this sector. The small bypass manual valve 3 is used to open the small bypass after the unit is shut down in winter, ensuring the circulating water has a flow path. However, due to unit shutdown in winter or water leakage from a single sector of the indirect cooling tower, the valve status is as follows: sector return water valve 1 and sector inlet water valve 2 are closed, cold water valve 6 and hot water valve 7 are open, and the temperature of the indirect cooling circulating water is approximately 40℃, leaking into the underground water tank connected to the underground drainage pipeline 12. Figure 3 As shown, water vapor usually returns and forms ice below the cold water valve 6 and hot water valve 7, causing the cold water valve 6 and hot water valve 7 to get stuck. This prevents the drain valve from closing when the sector is put into operation, thus preventing the sector from being put into operation smoothly.

[0028] In this embodiment, by adding an ice-melting pipeline, the cold water valve 6 and the hot water valve 7 are thawed, forming an indirect air-cooled system steam trap ice-melting pipeline. Specifically, as follows... Figure 1 As shown:

[0029] The bypass has a branch serving as an ice-melting pipeline. This pipeline is T-shaped and splits into two branches, one connecting to the return water branch and the other to the inlet water branch, for defrosting the cold water valve 6 and the other to the hot water valve 7. The branch connecting the ice-melting pipeline to the return water branch is equipped with a cold water steam trap and a manual ice-melting valve 72, while the branch connecting the ice-melting pipeline to the inlet water branch is equipped with a hot water steam trap and a manual ice-melting valve 73.

[0030] The connection point between the ice-melting pipeline and the bypass is located upstream of the manual bypass valve 3. The two branches of the ice-melting pipeline are connected to the upstream sides of the cold water valve 6 and the hot water valve 7, respectively, so that the water in the bypass flows through the ice-melting pipeline to flush and thaw the cold water valve 6 and the hot water valve 7, melting the ice accumulated below the cold water valve 6 and the hot water valve 7, thus achieving rapid ice-melting and valve warming operation.

[0031] Before the modification, the only way to melt ice in this type of sector during winter operation was to switch the sector return water valve 1 and sector inlet water valve 2 to local operation and manually jog them open slightly to allow flow through the cold water valve 6 and hot water valve 7. However, manually operating the sector return water valve 1 and sector inlet water valve 2 locally is difficult and requires high precision. Typically, their opening degree is controlled to around 5%, and different valves exhibit varying linearity. Therefore, there is a high risk of the sector freezing due to excessively rapid operation, resulting in significant losses.

[0032] This embodiment adds a manual de-icing valve 72 for cold water drain valves and a manual de-icing valve 73 for hot water drain valves. After the sector drains water, the circulating water pump runs, and the hot water in front of the sector return valve 1 and the sector inlet valve 2 is pressurized. Opening the manual de-icing valves 72 for cold water drain valves and 73 for hot water drain valves allows for de-icing operations on the cold water valve 6 and the hot water valve 7. This method has been applied in existing units, avoiding the hidden danger of large-scale freezing of the sector due to the original de-icing operation, improving the reliability of the intercooled sector operation, and providing strong technical support for the reliability of unit operation.

[0033] The ice melting operation method of the intermediate cold and hydrophobic valve has been applied to the currently active units, and the effect is good. The total operation time of the originally winter sector can be shortened from 6-8 hours to about 3 hours. It has broad prospects for popularization among indirect air cooling units of the same type.

Claims

1. A de-icing pipeline for a steam trap in an indirect air-cooled system, characterized in that, The heat exchange tube bundle is connected to an inlet water pipe and a return water pipe. The inlet water pipe is equipped with a sector return water valve, and the return water pipe is equipped with a sector inlet water valve. The sector return water valve and the sector inlet water valve are connected by a small bypass on the side away from the heat exchange tube bundle. A return water branch is provided between the heat exchange tube bundle and the sector return water valve, and an inlet water branch is provided between the heat exchange tube bundle and the sector inlet water valve; a cold water valve is provided on the return water branch, and a hot water valve is provided on the inlet water branch. The bypass has a branch as an ice-melting pipeline, which is divided into two branches that connect to the return water branch and the inlet water branch respectively, and is used to melt ice from the cold water valve and the hot water valve.

2. The de-icing pipeline of the steam trap in the indirect air-cooled system according to claim 1, characterized in that, The bypass is equipped with a manual bypass valve. The medium in the bypass flows from the inlet pipe to the return pipe. The connection point between the ice melting pipe and the bypass is located upstream of the manual bypass valve.

3. The de-icing pipeline of the steam trap in the indirect air-cooled system according to claim 1, characterized in that, The branch of the ice-melting pipeline connected to the return water tributary is equipped with a cold water steam trap and a manual ice-melting valve, and the branch of the ice-melting pipeline connected to the inlet water tributary is equipped with a hot water steam trap and a manual ice-melting valve; the two branches of the ice-melting pipeline are respectively connected to the upstream side of the cold water valve and the hot water valve.

4. The de-icing pipeline of the steam trap in the indirect air-cooled system according to claim 1, characterized in that, The heat exchange tube bundle is connected upstream of the return water pipe, and the downstream end of the return water pipe is connected to the cold wall of the self-circulating water pipeline; the upstream end of the inlet water pipe is connected to the hot wall of the self-circulating water pipeline, and the downstream end of the inlet water pipe is connected to the heat exchange tube bundle; the return water tributary and the inlet water tributary converge to the underground drainage pipeline.

5. The de-icing pipeline of the steam trap in the indirect air-cooled system according to claim 1, characterized in that, The return water pipe upstream of the bypass is connected to a cleaning pipe, which is connected to the cooling triangle cleaning equipment. The cleaning pipe is equipped with a manual cleaning valve.

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