Coal-fired unit steam supply system coupled with steam compressor

Abstract

The invention relates to the technical field of thermal power generation, and discloses a coal-fired unit steam supply system coupled with a steam compressor, and the coal-fired unit steam supply system comprises the steam compressor and a steam turbine; the steam turbine is provided with a plurality of steam sources, and each steam source is connected with a steam inlet of the steam compressor through a steam inlet pipeline; a steam outlet of the steam compressor is connected with a steam user through a steam exhaust pipeline; the steam compressor is used for receiving steam of one or more steam sources and doing work to increase pressure so that parameters of steam exhausted from a steam outlet of the steam compressor can meet requirements. According to the method, different requirements of steam users on steam use can be met under the wide-load deep peak regulation working condition of the unit.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of thermal power generation, in particular, to a coal-fired unit steam supply system coupled with a steam compressor. BACKGROUND

[0002] The domestic traditional thermal power generating unit continuously pursues the improvement of its power generation efficiency, and how to improve the economy of the traditional thermal power plant has become the most concerned topic in the industry. At the same time, with the continuous increase of industrial infrastructure and steam heat users around the power plant, the demand for steam has also changed, and in addition to the requirement of the power grid for deep peak shaving of the unit, the steam supply mode of the conventional thermal power generating unit has been unable to meet the requirements.

[0003] In the prior art, the conventional coal-fired unit can realize cogeneration, but due to the structure of the steam turbine, the number of steam extraction points is limited, the throttling regulation loss is large, and the economy and flexibility of heat and steam supply are also limited. At present, wind energy, solar energy, geothermal energy and other new energy sources also face many problems such as great influence of environmental factors and unstable power generation, and most of them rely on energy storage systems to meet the demand for large-scale stable peak shaving power generation, but the location of the infrastructure is limited and the investment cost is high in the early stage of operation. SUMMARY

[0004] The technical purpose of the present application is to overcome the shortcomings of the prior art, and to provide a coal-fired unit steam supply system coupled with a steam compressor, which can meet the different demands of steam users for steam under the condition of wide load and deep peak shaving of the unit.

[0005] The technical solution adopted by the present application is as follows: A coal-fired unit steam supply system coupled with a steam compressor, the coal-fired unit steam supply system comprising a steam compressor and a steam turbine; The steam turbine has a plurality of steam sources, and each steam source is connected to the steam inlet of the steam compressor through a steam inlet pipeline; The steam outlet of the steam compressor is connected to a steam user through a steam outlet pipeline; The steam compressor is used to receive steam from one or more steam sources and do work to increase the pressure so that the steam parameters of the steam outlet of the steam compressor meet the requirements.

[0006] Further, the plurality of steam sources includes a high-pressure cylinder exhaust outlet, a boiler reheater outlet, an intermediate-pressure cylinder inter-stage extraction, and an intermediate-pressure cylinder exhaust outlet.

[0007] Further, the steam inlet pipeline is provided with an inlet temperature adjusting device, and the inlet temperature adjusting device is used to adjust the temperature of the steam.

[0008] Further, the steam outlet pipeline is provided with an outlet temperature adjusting device, and the outlet temperature adjusting device is used to adjust the temperature of the steam.

[0009] Further, the steam inlet pipeline is provided with a filter screen for purifying steam.

[0010] Further, the steam compressor is connected with a driving device for providing driving force for the steam compressor.

[0011] Further, the driving device comprises a coupling, a gear box and an electric motor. The gear box is connected with the steam compressor through the coupling, and the gear box is connected with the electric motor.

[0012] Further, the steam compressor has an auxiliary system comprising a sealing system, an oil supply system and a heat exchange system.

[0013] Further, the steam compressor is connected with a water drainage device for draining condensed water generated by steam condensation.

[0014] Further, the inlet temperature adjusting device is a water spraying temperature adjusting device.

[0015] The one or more technical solutions provided by the present application have at least the following technical effects or advantages: The present application can meet the needs of steam users in a wider range by coupling the steam compressor with the coal-fired unit turbine and setting multiple steam sources, improve the utilization efficiency of turbine extraction, and thus meet the different needs of steam users in the wide load deep peak shaving operation of the unit.

[0016] The present application can flexibly adjust the steam temperature according to actual needs by setting the inlet temperature adjusting device and the outlet temperature adjusting device.

[0017] The present application can adapt to the wide load deep peak shaving operation of the turbine by setting the driving device to realize variable speed operation of the steam compressor, and ensure that the steam parameters output by the steam compressor in the safe operation range meet the needs of steam users.

[0018] The present application can timely drain the condensed water generated by steam condensation by setting the water drainage device, and improve the operation stability and reliability.

[0019] The present application ensures the stable operation of the steam compressor by setting the auxiliary system.

[0020] The present application can maintain strong steam supply capacity when the turbine is running at low load, and reduce the impact on downstream steam users.

[0021] The present application can reduce the dependence on external energy supply and realize cleaner and more efficient production operation mode. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are intended to provide further understanding of the embodiments of the present application, form a part of the present application, and do not constitute a limitation on the embodiments of the present application. Figure 1 is a structural schematic diagram of the present application; Wherein, 1 - import temperature control device; 2 - filter screen; 3 - steam compressor; 4 - coupling; 5 - gear box; 6 - motor; 7 - drain device; 8 - export temperature control device. DETAILED DESCRIPTION

[0023] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0024] In the following description, a lot of specific details are set forth in order to provide a thorough understanding of the present application, however, the present application can also be implemented in other ways different from the scope described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0025] Referring to Figure 1 , the present embodiment provides a coal-fired unit steam supply system coupled with a steam compressor, the coal-fired unit steam supply system comprising a steam compressor 3 and a steam turbine; The steam turbine has a plurality of steam sources, and each steam source is connected with the steam inlet of the steam compressor 3 through a steam inlet pipeline; The steam outlet of the steam compressor 3 is connected with a steam user through a steam exhaust pipeline; The steam compressor 3 is used for receiving steam of one or more steam sources and doing work to increase the pressure so that the steam parameters of the steam discharged from the steam outlet of the steam compressor 3 meet the requirements. The steam sources are selected according to the actual demand of the steam user.

[0026] The plurality of steam sources comprises a high-pressure cylinder exhaust outlet, a boiler reheater outlet, an intermediate-pressure cylinder inter-stage extraction, and an intermediate-pressure cylinder exhaust outlet.

[0027] The steam inlet pipeline is provided with an import temperature control device 1, and the import temperature control device 1 is used for adjusting the temperature of the steam. The import temperature control device 1 is a water injection temperature control device, which can be a water injection desuperheater or the like.

[0028] The steam exhaust pipeline is provided with an export temperature control device 8, and the export temperature control device 8 is used for adjusting the temperature of the steam. The export temperature control device 8 is a water injection temperature control device, which can be a water injection desuperheater or the like.

[0029] The steam inlet pipeline is provided with a filter screen 2, and the filter screen 2 is used for purifying the steam and filtering impurities.

[0030] The steam compressor 3 is connected with a driving device, and the driving device is used for providing driving force for the steam compressor 3.

[0031] The driving device comprises a coupling 4, a gear box 5 and a motor 6. The gear box 5 is connected with the steam compressor 3 through the coupling 4, and the gear box 5 is connected with the motor 6; the motor 6 provides driving force for the steam compressor 3, the output rotating speed of the motor 6 is adjusted through the gear box 5 to match the working requirement of the steam compressor 3, and the torque of the motor 6 is transmitted through the gear box 5. The operating parameters of the steam compressor 3, such as rotating speed and compression ratio, are adjusted in real time according to the wide load deepness peak regulation of the main steam turbine unit, so as to ensure that the steam parameters at the outlet of the steam compressor 3 always meet the user requirement.

[0032] The steam compressor 3 has an auxiliary system, which comprises a sealing system, an oil supply system and a heat exchange system, and is responsible for sealing, oil supply and heat exchange, etc. The auxiliary system adopts the prior art, and is not specifically limited and described in the embodiment.

[0033] The steam compressor 3 is connected with a drainage device 7, which is used to drain the condensed water generated due to steam condensation, and ensure the stable operation of the steam compressor 3.

[0034] In the embodiment, the medium-pressure cylinder exhaust outlet is used as the steam source, and when applied, the steam enters the steam compressor through the inlet temperature adjusting device 1 and the filter screen 2 in sequence, does work to increase the pressure, and then is adjusted through the outlet temperature adjusting device 8, so that the steam parameters match the requirement of the steam user.

[0035] In addition, the coal-fired unit steam supply system in the embodiment comprises a large number of valves, which are all conventional settings in the field, and the embodiment does not make specific description.

[0036] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all the preferred embodiments and all the changes and modifications falling within the scope of the present application.

[0037] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the present application. Thus, if these modifications and changes fall within the scope of the claims and their equivalents, they are intended to be included in the present application.

Claims

1. A coal-fired unit steam supply system coupled with a steam compressor, characterized in that: the coal-fired unit steam supply system comprises a steam compressor (3) and a steam turbine; the steam turbine has a plurality of steam sources, each steam source being connected to the steam inlet of the steam compressor (3) through a steam inlet pipeline; the steam outlet of the steam compressor (3) is connected to a steam user through a steam outlet pipeline; and the steam compressor (3) is used to receive steam from one or more steam sources and do work to increase the pressure so that the steam parameters of the steam discharged from the steam outlet of the steam compressor (3) meet the requirements.

2. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the plurality of steam sources comprise a high-pressure cylinder exhaust outlet, a boiler reheater outlet, an intermediate-pressure cylinder inter-stage extraction, and an intermediate-pressure cylinder exhaust outlet.

3. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam inlet pipeline is provided with an inlet temperature adjusting device (1), and the inlet temperature adjusting device (1) is used to adjust the temperature of the steam.

4. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam outlet pipeline is provided with an outlet temperature adjusting device (8), and the outlet temperature adjusting device (8) is used to adjust the temperature of the steam.

5. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam inlet pipeline is provided with a filter screen (2), and the filter screen (2) is used to purify the steam.

6. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam compressor (3) is connected to a driving device, and the driving device is used to provide driving force for the steam compressor (3).

7. The coal-fired unit steam supply system coupled with a steam compressor according to claim 6, characterized in that: the driving device comprises a coupling (4), a gear box (5), and an electric motor (6); the gear box (5) is connected to the steam compressor (3) through the coupling (4), and the gear box (5) is connected to the electric motor (6).

8. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam compressor (3) has an auxiliary system, and the auxiliary system comprises a sealing system, an oil supply system, and a heat exchange system.

9. The coal-fired unit steam supply system coupled with a steam compressor according to claim 1, characterized in that: the steam compressor (3) is connected to a drain device (7), and the drain device (7) is used to drain the condensed water generated due to steam condensation.

10. The coal-fired unit steam supply system coupled with a steam compressor according to claim 3, characterized in that: the inlet temperature adjusting device (1) is a water injection temperature adjusting device. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Images