WO2019015663A1

WO2019015663A1 - Terminal filtering device arranged before gas turbine

Info

Publication number: WO2019015663A1
Application number: PCT/CN2018/096404
Authority: WO
Inventors: 魏驰; 钱栋; 丁梦琪
Original assignee: 上海航天能源股份有限公司
Priority date: 2017-07-20
Filing date: 2018-07-20
Publication date: 2019-01-24

Abstract

A terminal filtering device arranged before a gas turbine comprises a main body, a gas inlet end and a gas outlet end. The main body has a vertical cylinder structure. The gas inlet end and the gas outlet end are located at either side of the main body. An L-shaped baffle plate is disposed at a position corresponding to the gas inlet end in the main body. A filter element (7) having a shape of a vertical cylinder is disposed at a rear side of the L-shaped baffle plate. The filter element (7) has an opening at an upper end thereof and is fixed inside the main body.

Description

Terminal filter device in front of gas turbine

This application claims the priority of the prior application as follows:

1. Chinese patent application number 201710593791.7, application date July 20, 2017

2. Chinese patent application number 201720881434.6, application date July 20, 2017

Technical field

The present application relates to a terminal filtering device in front of a gas turbine, and belongs to the technical field of filters.

Background technique

Before natural gas enters the gas turbine, the solid particles (generally composed of sand, rust, tar, and silica (SiO ₂ )) should be limited to prevent corrosion, fouling, and clogging of the gas nozzle. According to the requirements of E00-05139 R1 Gas Fuel Technical Specification: Solid particles supplied from the gas to the combustion system should be limited to less than 30 ppmwt. The maximum diameter is 5 μm and all solid particles cannot exceed 5 μm. In order to meet this specification, the owner must provide a filter to remove 99.5% by weight of all particles by weight and more than 5 μm of all particles before entering the gas turbine. The existing gas turbine terminal filtration generally adopts a Y-shaped filter with a simple structure. However, this filter is limited by the air flow pipe diameter, and the impurity removal ability is weak, which is likely to cause the filter to be clogged or even to be broken down, and needs to be frequently replaced. It has an impact on the normal operation of the gas turbine. .

Summary of invention

technical problem

The technical problem to be solved by the present application is: the existing terminal filtering device in front of the gas turbine, the filter is limited by the air flow pipe diameter, the impurity removal ability is weak, and the filter mesh is easily blocked or even broken down, and needs to be frequently replaced, for the gas turbine. Normal operation has an impact.

Problem solution

Technical solution

This application adopts the following technical solutions:

A terminal filter device in front of a gas turbine includes a main body, an intake end, and an air outlet end; the body is in a vertical cylindrical structure, and the intake end and the outlet end are located on both sides of the body; the main body corresponds to the intake end The L-shaped baffle is provided at the portion, and the vertical cylindrical filter element is disposed on the rear side of the L-shaped baffle. The upper end of the vertical cylindrical filter element is open and fixed inside the main body.

Further, the lower part of the main body is provided with a fixed platform 1 , and the bottom of the vertical cylindrical filter element is fixedly disposed with a lower hole plate, and the lower hole plate is fixedly connected with the fixed platform 1 by the middle shaft 2; the upper end of the middle shaft 2 is The end face flange 4 of the main body is fixedly connected.

Further, the vertical cylindrical filter element has a three-layer structure, the innermost layer is a filter screen composed of 15 mm*15 mm square holes, the middle layer is filtered with a 300-mesh stainless steel wire mesh, and the outermost layer is a circular hole having a diameter of 10 mm. The filter mesh.

Further, the inner wall of the main body and the outer wall of the L-shaped baffle are welded and fixed to the spacer ring 3, and the spacer ring 3 limits the circumference of the upper portion of the vertical cylindrical filter element.

Further, the upper end of the vertical cylindrical filter element is fixedly provided with a support structure with a hole.

Further, the vertical cylindrical filter elements of different heights have a plurality of vertical cylindrical filter elements of different heights according to the filter level.

Further, the fixed platform 1 has a through hole, and below the fixed platform 1 is a dirt collecting chamber.

Advantageous effects of the invention

Beneficial effect

The beneficial effects of the present application are:

1) The filter is not limited by the diameter of the gas flow, the filtration capacity is greatly enhanced, and the impurity removal ability is strong;

2) Set the L-shaped baffle to block the airflow, reduce the impact of the airflow on the vertical cylindrical filter element, and enhance the reliability;

3) The flow direction of the airflow forms a lateral-upward-lateral-downward-lateral flow process, increasing the flow stroke of the airflow inside the terminal filter device, and improving the filtering effect.

4) The collecting chamber realizes the collecting function and the design is ingenious.

5) The filter is provided with a three-layer structure, which not only ensures the structural strength but also improves the filtering effect.

6) Avoid the phenomenon that the filter is blocked or even broken down, and the gas engine is maintained in normal operation.

7) According to the need of filtration capacity, vertical cylindrical filter elements of different heights can be replaced.

8) The filter element has higher strength and more reasonable structure. Even if it is damaged, the debris will not enter the downstream to damage the downstream equipment; the volume of the filter cavity is increased, and the filter processing capacity is improved. The filter screen was transformed into a three-layer filter structure with increased filtration area, increased strength, and improved filtration progress.

Brief description of the drawing

DRAWINGS

Figure 1 is a schematic illustration of a Y-type filter employed in the prior art.

2 is a top plan view of a terminal filter device in front of a gas turbine of the present application.

Figure 3 is a view taken along the line A in Figure 2 .

Fig. 4 is a longitudinal sectional view of Fig. 3;

Fig. 5 is a schematic view showing the flow of gas in the terminal filter device.

Fig. 6 is a plan view showing the development of a sieve composed of a circular hole having a diameter of 10 mm in the outermost layer of the filter.

Fig. 7 is a schematic view of a filter screen composed of 15 mm * 15 mm square holes in the innermost layer of the filter.

In the figure, 1. fixed platform, 2. middle shaft, 3. isolation ring, 4. end flange, 5. dirt collection chamber, 6. L-shaped baffle, 7. vertical cylindrical filter.

Invention embodiment

Detailed ways

The present application is further described below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIGS. 1-7, a terminal filter device in front of a gas turbine includes a main body, an intake end, and an air outlet end; the body is in a vertical cylindrical structure, and the intake end and the outlet end are located on both sides of the body; An L-shaped baffle is arranged in a portion corresponding to the intake end in the main body, and a vertical cylindrical filter element is arranged on the rear side of the L-shaped baffle. The upper end of the vertical cylindrical filter element is open and fixed inside the main body.

In this embodiment, referring to FIG. 4, the lower part of the main body is provided with a fixed platform 1, and the bottom of the vertical cylindrical filter element is fixedly disposed with a lower hole plate, and the lower hole plate is fixedly connected with the fixed platform 1 by the middle shaft 2 The upper end of the center shaft 2 is fixedly connected to the end face flange 4 of the main body.

In this embodiment, referring to Figures 6-7, the vertical cylindrical filter element has a three-layer structure, the innermost layer is a filter screen composed of 15 mm × 15 mm square holes, and the intermediate layer is filtered with a 300-mesh stainless steel wire mesh. The outermost layer is a sieve composed of a circular hole having a diameter of 10 mm.

In this embodiment, referring to FIG. 4, the inner wall of the main body and the outer wall of the L-shaped baffle are welded and fixed to the spacer ring 3, and the spacer ring 3 limits the circumference of the upper portion of the vertical cylindrical filter element.

In this embodiment, referring to Fig. 4, the upper end of the vertical cylindrical filter element is fixedly provided with a support structure with a hole.

In this embodiment, the vertical cylindrical filter elements of different heights have a plurality of vertical cylindrical filter elements of different heights according to the filter level.

In this embodiment, referring to FIG. 4, the fixed platform 1 has a through hole, and below the fixed platform 1 is a dirt collecting chamber.

Since the baffle is arranged inside the filter, the gas passes through the inlet of the terminal filter device, and large particulate impurities will hit the L-shaped baffle at the inlet and fall into the bottom trap chamber due to gravity. The gas then continues to flow upwards to the various parts of the circumference of the screen, through the filter element to the interior and out of the filter.

The improvement of the vertical cylindrical filter element increases the volume of the inner cavity of the filter, and the setting of the baffle will filter large particles of impurities in advance, avoiding a large impact on the wall of the filter screen and prolonging the use time of the filter screen.

The filter screen of the present application adopts a three-layer filter structure, the innermost layer is a filter screen composed of 15mm×15mm square holes (see FIG. 7 for details), and the intermediate layer is filtered with a grade of 300 mesh stainless steel mesh, and the outermost layer. It is a filter made up of 10mm diameter holes (see Figure 6 for details). Such a three-layer filter structure increases the filtration area, increases the strength, and improves the filtration accuracy.

The original Y-type filter needs to be cleaned and replaced every day. This application uses a new filter to greatly improve the filtration efficiency and reduce the labor.

Internal test A: The two units have been rebuilt with 4 filters. The unit is running during the day and stopped at night. It has been used for 2 years since the filter was changed, and there have been no problems. The longest continuous start-up time is 2-3 months (with load in summer).

Internal test B: The two units have been rebuilt with 4 filters. The maximum continuous running time of the unit is 4×24 hours. It has been used for 1 year since the filter was replaced. It is working well. Clean the filter regularly every 6 months.

The filter device of the present application has higher strength and more reasonable structure. Even if it is damaged, the debris does not enter the downstream damage to the downstream equipment; the volume of the filter cavity is increased, and the filter processing capacity is improved. The filter screen is transformed into a three-layer filter structure, and the filtration area is increased, the strength is increased, and the filtration progress is improved.

The above is a preferred embodiment of the present application, and those skilled in the art can also make various changes or improvements on the basis of the present invention. These changes or improvements should be claimed in the present application without departing from the general concept of the present application. Within the scope of.