Energy gradient utilization thermoelectric decoupling steam supply system comprising compressor dragged by backpressure turbine

Abstract

The utility model belongs to the technical field of steam turbines, and particularly relates to an energy gradient utilization thermoelectric decoupling steam supply system comprising a compressor dragged by a back pressure turbine. According to the technical scheme, the energy gradient utilization thermoelectric decoupling steam supply system comprising the compressor dragged by the back pressure machine comprises a high-pressure cylinder, an intermediate-pressure cylinder, the back pressure machine and a steam compressor, the high-pressure cylinder is connected with the intermediate-pressure cylinder through a rotating shaft, and the back pressure machine is connected with the steam compressor through a rotating shaft; the main steam extraction pipeline is communicated with a steam inlet of the high-pressure cylinder and a steam inlet of the back pressure machine, a steam exhaust outlet of the high-pressure cylinder and a steam exhaust outlet of the back pressure machine are communicated with the reheating water return pipeline, and a steam exhaust outlet of the intermediate-pressure cylinder is communicated with a steam inlet of the steam compressor through an intermediate steam exhaust and extraction pipeline. And a steam exhaust outlet of the steam compressor is communicated with an industrial steam supply pipeline. The utility model provides an energy gradient utilization thermoelectric decoupling steam supply system comprising a compressor dragged by a backpressure turbine.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam turbines, and particularly relates to an energy cascade utilizing thermoelectric decoupling steam supply system comprising a back pressure machine driving a compressor. Background Art

[0002] Steam turbine is a rotating machine that uses steam as power and converts the thermal energy of steam into mechanical work. It is the most widely used prime mover in modern thermal power plants. With the increasing demand for high-parameter steam external supply in power plants, the conventional reheating and intermediate exhaust steam extraction methods of steam turbines cannot fully meet user needs. Utility Model Content

[0003] In order to solve the above-mentioned problems existing in the prior art, the purpose of the utility model is to provide an energy cascade utilization and thermoelectric decoupling steam supply system including a back pressure machine driving a compressor, which improves the steam extraction parameters by the back pressure machine and the steam compressor to meet the high-parameter steam demand, while realizing energy cascade utilization and thermoelectric decoupling.

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

[0005] An energy cascade utilizing thermoelectric decoupling steam supply system including a back pressure machine driving a compressor, comprising a high-pressure cylinder, an intermediate-pressure cylinder, a back pressure machine, and a steam compressor, wherein the high-pressure cylinder and the intermediate-pressure cylinder are connected via a rotating shaft, and the back pressure machine and the steam compressor are connected via a rotating shaft; the main steam extraction pipeline is respectively connected to the steam inlet of the high-pressure cylinder and the steam inlet of the back pressure machine, the exhaust steam outlet of the high-pressure cylinder and the exhaust steam outlet of the back pressure machine are respectively connected to the reheat return water pipeline, the exhaust steam outlet of the intermediate-pressure cylinder is connected to the steam inlet of the steam compressor via the intermediate exhaust steam extraction pipeline, and the exhaust steam outlet of the steam compressor is connected to the industrial steam supply pipeline.

[0006] While maintaining the normal operation of the original steam turbine reheat system, steam is extracted from the steam inlet of the high-pressure cylinder to enter the back pressure machine, and then enters the reheat return pipe from the exhaust outlet of the back pressure machine; steam is extracted from the exhaust outlet of the medium-pressure cylinder to enter the steam compressor, and the steam compressor is driven by the back pressure machine to work. It is compressed by the steam compressor to the required parameters for steam supply and enters the industrial steam supply pipeline.

[0007] The utility model improves the steam extraction parameters through the back pressure machine and the steam compressor to meet the high-parameter steam demand, and at the same time realizes the energy cascade utilization and thermal-electric decoupling.

[0008] As a preferred solution of the utility model, a boiler is also included, and a main steam extraction pipeline is connected to the main steam outlet of the boiler. The boiler supplies steam to the main steam extraction pipeline to ensure the normal operation of the high-pressure cylinder and to increase the high-pressure steam for the back pressure machine.

[0009] As a preferred solution of the utility model, the steam inlet of the intermediate pressure cylinder is connected to a medium pressure steam inlet pipeline, which provides medium pressure steam to the intermediate pressure cylinder to ensure the normal operation of the intermediate pressure cylinder.

[0010] As a preferred solution of the utility model, the middle row steam extraction pipeline is connected with a middle row branch pipeline. The exhaust steam of the intermediate pressure cylinder not only supplies steam to the steam compressor through the middle row steam extraction pipeline, but also exhausts steam to other equipment through the middle row branch pipeline.

[0011] As a preferred solution of the utility model, a generator is connected to the rotating shaft between the high-pressure cylinder and the medium-pressure cylinder. The high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder rotate under the power of steam, thereby rotating and driving the generator to generate electricity.

[0012] As a preferred solution of the utility model, a low-pressure cylinder is connected to the rotating shaft between the high-pressure cylinder and the medium-pressure cylinder.

[0013] The beneficial effects of the utility model are:

[0014] Under the condition of maintaining the normal operation of the original steam turbine reheat system, steam is extracted from the steam inlet of the high-pressure cylinder to enter the back pressure machine, and enters the reheat return pipe from the exhaust outlet of the back pressure machine; steam is extracted from the exhaust outlet of the medium-pressure cylinder to enter the steam compressor, and the steam compressor is driven to work by the back pressure machine, and is compressed to the required parameters for steam supply by the steam compressor, and enters the industrial steam supply pipeline. The utility model improves the extraction parameters through the back pressure machine and the steam compressor to meet the high-parameter steam demand, and at the same time realizes the energy cascade utilization and thermal power decoupling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure: 1- high-pressure cylinder; 2- back pressure machine; 3- medium-pressure cylinder; 4- steam compressor; A- main steam extraction pipeline; B- reheat return pipeline; C- medium exhaust steam extraction pipeline. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0019] like Figure 1 As shown, the energy ladder of the back pressure machine driving the compressor in this embodiment utilizes a thermoelectric decoupling steam supply system, including a high-pressure cylinder 1, a medium-pressure cylinder 3, a back pressure machine 2, and a steam compressor 4. The high-pressure cylinder 1 and the medium-pressure cylinder 3 are connected by a rotating shaft, and the back pressure machine 2 and the steam compressor 4 are connected by a rotating shaft.

[0020] The main steam extraction pipeline A is connected to the steam inlet of the high-pressure cylinder 1 and the steam inlet of the back pressure machine 2 respectively, the exhaust outlet of the high-pressure cylinder 1 and the exhaust outlet of the back pressure machine 2 are connected to the reheat return pipe B respectively, the exhaust outlet of the intermediate pressure cylinder 3 is connected to the steam inlet of the steam compressor 4 through the intermediate exhaust steam extraction pipeline C, and the exhaust outlet of the steam compressor 4 is connected to the industrial steam supply pipeline.

[0021] While maintaining the normal operation of the original steam turbine reheat system, steam is extracted from the steam inlet of the high-pressure cylinder 1 to enter the back pressure machine 2, and then enters the reheat return pipe B from the exhaust outlet of the back pressure machine 2; steam is extracted from the exhaust outlet of the medium-pressure cylinder 3 to enter the steam compressor 4, and the steam compressor 4 is driven to work by the back pressure machine 2. The steam is compressed by the steam compressor 4 to the required parameters for steam supply and then enters the industrial steam supply pipeline.

[0022] The utility model improves the steam extraction parameters through the back pressure machine 2 and the steam compressor 4 to meet the high-parameter steam demand, while realizing the energy cascade utilization and thermal-electric decoupling.

[0023] The boiler is also included, and the main steam extraction pipeline A is connected to the main steam outlet of the boiler. The boiler supplies steam to the main steam extraction pipeline A to ensure the normal operation of the high-pressure cylinder 1 and to increase the high-pressure steam for the back pressure machine 2.

[0024] The steam inlet of the intermediate pressure cylinder 3 is connected with an intermediate pressure steam inlet pipeline, which provides intermediate pressure steam to the intermediate pressure cylinder 3 to ensure the normal operation of the intermediate pressure cylinder 3.

[0025] The middle row steam extraction pipeline C is connected to a middle row branch pipeline. The exhaust steam of the intermediate pressure cylinder 3 not only supplies steam to the steam compressor 4 through the middle row steam extraction pipeline C, but also exhausts steam to other equipment through the middle row branch pipeline.

[0026] A generator is connected to the rotating shaft between the high-pressure cylinder 1 and the medium-pressure cylinder 3. The high-pressure cylinder 1, the medium-pressure cylinder 3 and the low-pressure cylinder rotate under the power of steam, thereby rotating and driving the generator to generate electricity.

[0027] A low-pressure cylinder is connected to the rotating shaft between the high-pressure cylinder 1 and the medium-pressure cylinder 3 .

[0028] Example:

[0029] The energy cascade utilizing thermoelectric decoupling steam supply system of the present embodiment, which includes a back pressure machine driving a compressor, comprises a high-pressure cylinder 1, an intermediate-pressure cylinder 3, a back pressure machine 2, a steam compressor 4 and a pipeline; the steam inlet of the high-pressure cylinder 1 and the steam inlet of the back pressure machine 2 are connected to the main steam extraction pipeline A, the exhaust steam outlet of the high-pressure cylinder 1 and the exhaust steam outlet of the back pressure machine 2 are connected to the reheat return water pipeline B, the exhaust steam outlet of the intermediate-pressure cylinder 3 and the intermediate exhaust steam extraction pipeline C are connected to the steam inlet of the steam compressor 4, the exhaust steam outlet of the steam compressor 4 is connected to the industrial steam supply pipeline, and the back pressure machine 2 is connected to the steam compressor 4. While maintaining the normal operation of the original steam turbine reheat system, steam is extracted from the steam inlet of the high-pressure cylinder 1 to enter the back pressure machine 2, and then enters the reheat return pipe B from the exhaust outlet of the back pressure machine 2; steam is extracted from the exhaust outlet of the medium-pressure cylinder 3 to enter the steam compressor 4, and the steam compressor 4 is driven to work by the back pressure machine 2. The steam is compressed by the steam compressor 4 to the required parameters for steam supply and then enters the industrial steam supply pipeline.

[0030] The present utility model is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present utility model fall within the protection scope of the present utility model.

Claims

1. An energy cascade utilizing thermoelectric decoupling steam supply system including a back pressure machine driving a compressor, Features: The invention comprises a high-pressure cylinder (1), an intermediate-pressure cylinder (3), a back pressure machine (2), and a steam compressor (4); the high-pressure cylinder (1) and the intermediate-pressure cylinder (3) are connected via a rotating shaft, and the back pressure machine (2) and the steam compressor (4) are connected via a rotating shaft; a main steam extraction pipeline (A) is connected to the steam inlet of the high-pressure cylinder (1) and the steam inlet of the back pressure machine (2), respectively; the exhaust steam outlet of the high-pressure cylinder (1) and the exhaust steam outlet of the back pressure machine (2) are connected to the reheat return water pipeline (B), respectively; the exhaust steam outlet of the intermediate-pressure cylinder (3) is connected to the steam inlet of the steam compressor (4) via the intermediate exhaust steam extraction pipeline (C), and the exhaust steam outlet of the steam compressor (4) is connected to the industrial steam supply pipeline.

2. According to claim 1, a heat-electric decoupling steam supply system comprising a back pressure machine driving a compressor, Features: It also includes a boiler, and a main steam extraction pipeline (A) is connected to the main steam outlet of the boiler.

3. According to claim 1, a heat-electric decoupling steam supply system comprising a back pressure machine driving a compressor, Features: The steam inlet of the medium-pressure cylinder (3) is connected to a medium-pressure steam inlet pipeline.

4. The energy cascade utilizing thermoelectric decoupling steam supply system comprising a back pressure machine driving a compressor according to claim 1, Features: The middle row steam extraction pipeline (C) is connected with a middle row branch pipeline.

5. The energy cascade utilizing thermoelectric decoupling steam supply system comprising a back pressure machine driving a compressor according to claim 1, Features: A generator is connected to the rotating shaft between the high-pressure cylinder (1) and the medium-pressure cylinder (3).

6. The energy cascade utilizing thermoelectric decoupling steam supply system comprising a back pressure machine driving a compressor according to claim 1, Features: A low-pressure cylinder is connected to the rotating shaft between the high-pressure cylinder (1) and the medium-pressure cylinder (3).

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