Two-stage cooling type steam seal cooling device

Abstract

The utility model belongs to steam seal cooling equipment of an auxiliary machine of a steam turbine, and aims to provide a two-stage cooling type steam seal cooler device which has the characteristics of low power steam consumption and strong applicability. According to the technical scheme, the two-stage cooling type steam seal cooling device comprises a cooler arranged horizontally and an ejector communicated with the cooler. The cooler comprises a front cooler, a rear cooler, a middle water chamber arranged between the front cooler and the rear cooler, a left water chamber arranged on the left side of the front cooler and a right water chamber arranged on the right side of the rear cooler; the device is characterized in that the front cooler and the rear cooler are respectively communicated with the ejector through pipelines, and a power steam inlet of the ejector is communicated with a power steam pipeline; therefore, steam and water output by the front cooler are conveyed to the rear cooler through the ejector to be continuously cooled.

Description

Technical Field

[0001] The utility model belongs to steam turbine auxiliary machine steam seal cooling equipment, in particular to a two-stage cooling type steam seal cooling device, which is used for cooling the steam turbine shaft seal leakage and ensuring the steam turbine shaft seal effect. Background Art

[0002] At present, the steam seal cooler structure in most of the existing equipment is single-stage cooling, that is, the shaft seal leakage directly enters the steam seal cooler for heat exchange, and the uncondensed part is sucked away by negative pressure when passing through the ejector, and finally discharged into the atmosphere. This structure takes away a lot of steam, and there is a lot of steam waste; on the other hand, the factory has requirements for steam discharge, and it is not suitable to discharge a large amount of steam. Utility Model Content

[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned background technology and provide a two-stage cooling steam seal cooler device, which should have the characteristics of less power steam consumption and strong applicability.

[0004] The technical solution provided by the utility model is:

[0005] A two-stage cooling steam seal cooling device includes a horizontally arranged cooler and an ejector connected to the cooler, the cooler includes a front cooler, an aftercooler, an intermediate water chamber arranged between the front cooler and the aftercooler, a left water chamber arranged on the left side of the front cooler, and a right water chamber arranged on the right side of the aftercooler; it is characterized in that: the front cooler and the aftercooler are respectively connected to the ejector through pipelines, and the power steam inlet of the ejector is connected to the power steam pipeline; thereby, the steam and water output by the front cooler are transported to the aftercooler through the ejector for further cooling.

[0006] The top end of the front cooler is provided with an extraction pipe, through which the ejector extracts steam from the inner cavity of the front cooler; the top end of the rear cooler is provided with an input pipe, through which the steam ejected by the ejector is input into the inner cavity of the rear cooler for cooling treatment.

[0007] The front cooler and the after cooler are respectively provided with a tube bundle arranged horizontally and connected to the water chamber. The tube bundle is composed of a plurality of cooling tubes arranged parallel to each other and is used for heat exchange with the steam in the cooler.

[0008] The top of the front cooler is provided with a shaft seal air leakage inlet, and the bottom is provided with a front cooler drain port; the top of the aftercooler is provided with a non-condensable gas exhaust port, and the bottom is provided with an aftercooler drain port.

[0009] The bottom end of the intermediate water chamber is provided with a cooling water inlet; the top end of the intermediate water chamber is provided with a cooling water outlet.

[0010] The top ends of the left water chamber and the right water chamber are respectively provided with water chamber air vents, and the bottom ends are respectively provided with water chamber water discharge ports.

[0011] The cooler is mounted on the ground via a saddle.

[0012] The beneficial effects of the utility model are as follows: compared with the conventional single-stage steam seal cooler, the two-stage cooling steam seal cooling device provided forms a stable micro-negative pressure in the front cooler, consumes less power steam, and the rear cooler can cool the steam after injection, and recycle the condensed water to achieve the requirements of energy saving and emission reduction. On the other hand, the device has strong applicability, and multiple flow structures can be selected to match according to the user's water demand. It is used for steam turbine shaft seal steam, with significant effects, and can meet the diversified needs of the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the main structure of an embodiment of the utility model.

[0014] Figure 2 It is a left-side structural schematic diagram of an embodiment of the utility model.

[0015] Numbers in the figure: 1. Shaft seal leakage inlet; 2. Water chamber vent; 3. Water chamber drain; 4. Non-condensable gas exhaust port; 5. Cooling water inlet; 6. Cooling water outlet; 7. Front cooler drain port; 8. Power steam inlet; 9. Ejector; 10. Saddle; 11. Front cooler; 12. Rear cooler drain port; 13. Rear cooler; 14. Support frame; 15. Extraction pipe; Input pipe 16; A. Left water chamber; B. Middle water chamber; C. Right water chamber. DETAILED DESCRIPTION

[0016] The utility model will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0017] The two-stage cooling steam seal cooling device shown in the attached figure comprises a horizontally arranged cooler and an ejector 9 connected to the cooler, wherein the cooler comprises a front cooler 11, a rear cooler 13, an intermediate water chamber B arranged between the front cooler and the rear cooler, a left water chamber A arranged on the left side of the front cooler, and a right water chamber C arranged on the right side of the rear cooler; the cooler is installed on the ground through a saddle 10. The front cooler is provided with a horizontally arranged tube bundle whose two ends are connected to the left water chamber and the intermediate water chamber respectively, and the rear cooler is provided with a horizontally arranged tube bundle whose two ends are connected to the intermediate water chamber and the right water chamber respectively; the tube bundle is composed of a plurality of cooling tubes arranged in parallel with each other.

[0018] The improvement of the utility model is that the front cooler is connected with the inlet of the ejector through a pipeline, so as to extract steam from the front cooler; the aftercooler is connected with the outlet of the ejector through a pipeline, so as to input the steam and water ejected by the ejector into the aftercooler; the motive steam inlet 8 of the ejector is also connected to the motive steam pipeline, so as to provide driving force for the ejector so that the ejector can input the steam output by the front cooler to the aftercooler for further cooling treatment.

[0019] The top end of the front cooler is provided with an extraction pipe 15, through which the ejector extracts steam from the inner cavity of the front cooler; the top end of the front cooler is also provided with a shaft seal leakage inlet 1, which is connected to a delivery pipe for conveying turbine shaft seal leakage (steam), and inputs the shaft seal leakage into the inner cavity of the front cooler for preliminary cooling treatment; the bottom end of the front cooler is provided with a front cooler drain port 7 for discharging accumulated water in the inner cavity of the front cooler.

[0020] The top end of the aftercooler is provided with an input pipe 16, through which the steam ejected by the ejector is input into the inner cavity of the aftercooler for re-cooling treatment; the top end of the aftercooler is also provided with a non-condensable gas exhaust port 4 for discharging the non-condensable gas in the steam into the atmosphere; the bottom end of the aftercooler is provided with an aftercooler drain port 12 for discharging the accumulated water in the inner cavity of the aftercooler.

[0021] The bottom end of the intermediate water chamber is provided with a cooling water inlet 5; the top end of the intermediate water chamber is provided with a cooling water outlet 6. The cooling water enters the lower half of the intermediate water chamber from the cooling water inlet, then enters the left water chamber through some cooling pipes in the tube bundle, and then enters the right water chamber through the remaining cooling pipes in the tube bundle, and then gathers in the upper half of the intermediate water chamber, and finally outputs from the cooling water outlet 6 of the intermediate water chamber.

[0022] The top of the left water chamber and the right water chamber are respectively provided with a water chamber air release port 2, and the bottom is respectively provided with a water chamber water discharge port 3.

[0023] The shaft seal air leakage inlet is provided with a pressure gauge and a temperature gauge, the power steam inlet is provided with a pressure gauge, and the cooling water inlet and cooling water outlet are also provided with pressure gauges respectively, so as to facilitate monitoring by operators.

[0024] The working principle of the utility model is as follows: the leakage from the front and rear shaft seals of the steam turbine enters the front cooler 11 for cooling from the shaft seal leakage inlet 1 through the leakage pipe, the uncooled part of the leakage is extracted by the steam ejector 9, and is mixed with the power steam input from the power steam inlet 8 in the steam ejector and then ejected into the aftercooler 13 for cooling again, and the final non-condensable gas is discharged from the non-condensable gas exhaust port 4; the cooling water first enters part of the cooling pipes in the front cooler through the cooling water inlet 5 at the bottom of the intermediate water chamber, and exchanges heat with the steam entering the inner cavity of the front cooler, and then collects from another part of the cooling pipes in the front cooler to the intermediate water chamber, and exchanges heat with the steam in the inner cavity of the aftercooler again; finally, the cooling water is collected by another part of the cooling pipes of the aftercooler and flows out from the cooling water outlet 6 at the top of the intermediate water chamber; the condensate of the front and aftercoolers is drained from the front cooler drain port 7 and the aftercooler drain port 12 respectively.

Claims

1. A two-stage cooling steam seal cooling device, comprising a horizontally arranged cooler and an ejector (9) connected to the cooler, wherein the cooler comprises a front cooler (11), a rear cooler (13), an intermediate water chamber (B) arranged between the front cooler and the rear cooler, a left water chamber (A) arranged on the left side of the front cooler, and a right water chamber (C) arranged on the right side of the rear cooler; characterized in that: The front cooler and the after cooler are connected to the ejector through pipelines respectively, and the power steam inlet (8) of the ejector is connected to the power steam pipeline; thus, the steam and water output from the front cooler are transported to the after cooler through the ejector for further cooling.

2. The two-stage cooling steam seal cooling device according to claim 1 is characterized in that: The top end of the front cooler is provided with an extraction pipe (15), through which the ejector extracts steam from the inner cavity of the front cooler; the top end of the rear cooler is provided with an input pipe (16), through which the steam ejected by the ejector is input into the inner cavity of the rear cooler for cooling treatment.

3. The two-stage cooling steam seal cooling device according to claim 2 is characterized in that: The front cooler and the after cooler are respectively provided with a tube bundle arranged horizontally and connected to the water chamber. The tube bundle is composed of a plurality of cooling tubes arranged parallel to each other and is used for heat exchange with the steam in the cooler.

4. The two-stage cooling steam seal cooling device according to claim 3 is characterized in that: The top of the front cooler is provided with a shaft seal leakage inlet (1), and the bottom is provided with a front cooler drain port (7); the top of the rear cooler is provided with a non-condensable gas exhaust port (4), and the bottom is provided with a rear cooler drain port (12).

5. The two-stage cooling steam seal cooling device according to claim 4 is characterized in that: The bottom end of the intermediate water chamber is provided with a cooling water inlet (5); the top end of the intermediate water chamber is provided with a cooling water outlet (6).

6. The two-stage cooling steam seal cooling device according to claim 5 is characterized in that: The top ends of the left water chamber and the right water chamber are respectively provided with water chamber air discharge ports (2) and the bottom ends are respectively provided with water chamber water discharge ports (3).

7. The two-stage cooling steam seal cooling device according to claim 6 is characterized in that: The cooler is installed on the ground via a saddle (10).

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