Economical combined cycle unit heat supply system

Abstract

The utility model discloses an economical combined cycle unit heat supply system which comprises a steam turbine, a condenser is fixedly installed at the lower end of the right side of the steam turbine through a pipeline, and a drain flash tank is fixedly installed on the left side of the condenser through a pipeline. A high-pressure main steam valve bypass temperature and pressure reducer rear pipeline is fixedly installed at the left end of the top of the condenser through a pipeline, and a main steam drain pipe, a high-pressure main steam-liquid control valve and a high-pressure main steam-liquid movable valve are sequentially and fixedly installed at the lower end of the left side of the steam turbine through pipelines from right to left. The minimum opening degree of the rotating partition plate in the steam turbine is gradually adjusted from 20% to 10% (at the moment, the maximum steam extraction capacity is 65 t / h) and 5% (at the moment, the maximum steam extraction capacity is 70 t / h), finally, the minimum opening degree of the rotating partition plate is limited to 3.5% by comprehensively considering safety and economical efficiency, the maximum steam extraction capacity of the steam turbine is gradually improved from 56.5 t / h to 78 t / h, the efficiency of the steam turbine is effectively improved, and the energy consumption of the steam turbine is reduced. Natural gas consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of combined cycle units, and particularly to an economic combined cycle unit heating system. Background Technique

[0002] The combined cycle unit is an advanced power generation technology that combines a gas turbine and a steam turbine to achieve higher energy utilization efficiency and power generation efficiency. This technology mainly consists of three parts: a gas turbine (including a compressor, a combustion chamber, a turbine, a control system, and an auxiliary system), a heat recovery steam generator, and a steam turbine. The working principle of the combined cycle unit is to introduce the "exhaust gas" discharged from the gas turbine into the heat recovery steam generator to heat water to generate high-temperature and high-pressure steam, and then drive the steam turbine to do work, thus forming a whole. This technology not only improves energy utilization efficiency but also reduces environmental pollution. It is an environmentally friendly and efficient power generation method. During the long-term heating process of the current combined cycle unit, with the increase in heating demand during peak hours, the heating demand exceeds the heating capacity of single-unit operation. Whether to start the standby gas boiler for heating often depends on the experience judgment of the staff. If started, it will increase natural gas consumption and affect economy. If not started, it may lead to a decrease in heat network pressure. Content of the Utility Model

[0003] The purpose of the utility model is to provide an economic combined cycle unit heating system.

[0004] To achieve the above purpose, the utility model provides the following technical solution: An economic combined cycle unit heating system includes a steam turbine. The lower end on the right side of the steam turbine is fixedly installed with a condenser through a pipeline. The left side of the condenser is fixedly installed with a drain flash tank through a pipeline. The left end at the top of the condenser is fixedly installed with a pipeline after a high-pressure main steam valve bypass desuperheater and pressure reducer. The lower end on the left side of the steam turbine is fixedly installed with a main steam drain pipe, a high-pressure main steam liquid control valve, and a high-pressure main steam hydraulic valve in sequence from right to left through a pipeline. The right end at the top of the steam turbine is fixedly installed with a low-pressure inlet valve rear drain pipe, a low-pressure supplementary steam pneumatic valve, a low-pressure inlet valve front drain pipe, and a low-pressure supplementary steam pneumatic control valve in sequence from right to left through a pipeline. The right end at the top of the condenser is fixedly installed with a low-pressure bypass pneumatic control valve.

[0005] As a preferred solution, a main steam control valve valve housing drain pipe is fixedly installed at the bottom of the high-pressure main steam liquid control valve.

[0006] As a preferred solution, a cylinder front drain pipe is fixedly installed at the left end of the bottom of the steam turbine, and a cylinder rear drain pipe is fixedly installed at the right end of the bottom of the steam turbine. The number of the cylinder rear drain pipes is three.

[0007] As a preferred solution, a high-pressure bypass pneumatic control valve is fixedly installed between the left side of the pipeline after the high-pressure main steam valve bypass desuperheating and pressure reducing device and the left side of the high-pressure main steam hydraulic valve through a pipeline.

[0008] As a preferred solution, a drain pipe before the low-pressure main steam bypass desuperheating and pressure reducing device is fixedly installed between the left side of the low-pressure bypass pneumatic control valve and the left side of the low-pressure supplementary steam pneumatic control valve through a pipeline.

[0009] As a preferred solution, a steam extraction safety valve, a drain pipe before the steam extraction check valve, a steam extraction motorized check valve, a drain pipe before the steam extraction quick closing valve, a steam extraction pneumatic quick closing valve, and a steam extraction pneumatic control valve are fixedly installed in sequence from right to left through a pipeline at the middle end of the top of the steam turbine.

[0010] As a preferred solution, a steam extraction valve is fixedly installed on the left side of the steam extraction pneumatic control valve through a pipeline, and a steam extraction check valve is fixedly installed on the left side of the steam extraction valve through a pipeline.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the present utility model, the minimum opening of the rotating baffle inside the steam turbine is gradually adjusted from 20% to 10% (the maximum steam extraction volume is 65 t / h at this time), 5% (the maximum steam extraction volume is 70 t / h at this time), and finally, considering safety and economy comprehensively, the minimum opening of the rotating baffle is limited to 3.5%. The maximum steam extraction volume of the steam turbine is gradually increased from 56.5 t / h to 78 t / h, effectively improving the efficiency of the steam turbine and saving natural gas consumption. The coal consumption of the unit at the best operating condition is only 194 g / kwh. Secondly, by adding water outlet holes to the condensate replenishing pipe of the condenser, the maximum hourly replenishing water volume of the condenser is increased from the original 70 t / h to 85 t / h, effectively ensuring the heating water supply. Description of the Drawings

[0013] Figure 1 It is the system schematic diagram of the present utility model. Specific Embodiments

[0014] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Second, the "one embodiment" or "embodiment" referred to herein means a specific feature, structure, or characteristic that may be included in at least one implementation manner of the present utility model. The "in one embodiment" that appears in different places in this specification does not all refer to the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0016] Embodiment 1:

[0017] Please refer to Figure 1 As shown, the present utility model provides an economic combined cycle unit heating system, including a steam turbine. The lower end on the right side of the steam turbine is fixedly installed with a condenser through a pipeline. The left side of the condenser is fixedly installed with a drain flash tank through a pipeline. The left end at the top of the condenser is fixedly installed with a pipeline after a high-pressure main steam valve bypass desuperheater and pressure reducer. The lower end on the left side of the steam turbine is fixedly installed with a main steam drain pipe, a high-pressure main steam liquid control valve, and a high-pressure main steam hydraulic valve in sequence from right to left through a pipeline. The right end at the top of the steam turbine is fixedly installed with a low-pressure intake valve rear drain pipe, a low-pressure supplementary steam pneumatic valve, a low-pressure intake valve front drain pipe, and a low-pressure supplementary steam pneumatic control valve in sequence from right to left through a pipeline. The right end at the top of the condenser is fixedly installed with a low-pressure bypass pneumatic control valve through a pipeline.

[0018] In this technical solution, by gradually adjusting the minimum opening of the rotating partition inside the steam turbine from 20% to 10% (at this time, the maximum extraction steam flow is 65 t / h), 5% (at this time, the maximum extraction steam flow is 70 t / h), and finally restricting the minimum opening of the rotating partition to 3.5% considering safety and economy comprehensively, the maximum extraction steam flow of the steam turbine is gradually increased from 56.5 t / h to 78 t / h, effectively improving the efficiency of the steam turbine and saving natural gas consumption. The coal consumption of the unit at the best operating condition is only 194 g / kwh. Second, by increasing the water outlet holes in the condenser make-up water pipe, the maximum make-up water volume of the condenser per hour is increased from the original 70 t / h to 85 t / h, effectively ensuring the heating water supply.

[0019] Embodiment 2:

[0020] On the basis of Embodiment 1, the present utility model is as Figure 1As shown in the figure, a drain pipe for the main steam regulating valve shell is fixedly installed at the bottom of the high-pressure main steam hydraulic regulating valve. A drain pipe for the front part of the cylinder is fixedly installed at the left end of the bottom of the steam turbine, and a drain pipe for the rear part of the cylinder is fixedly installed at the right end of the bottom of the steam turbine. The number of drain pipes for the rear part of the cylinder is three. A high-pressure bypass pneumatic regulating valve is fixedly installed between the left side of the pipeline after the high-pressure main steam valve bypass desuperheating and pressure reducing device and the left side of the high-pressure main steam hydraulic valve through a pipeline. A drain pipe before the low-pressure main steam bypass desuperheating and pressure reducing device is fixedly installed between the left side of the low-pressure bypass pneumatic regulating valve and the left side of the low-pressure supplementary steam pneumatic regulating valve through a pipeline. On the middle part of the top of the steam turbine, a steam extraction safety valve, a drain pipe before the steam extraction check valve, a steam extraction motorized check valve, a drain pipe before the steam extraction quick shut-off valve, a steam extraction pneumatic quick shut-off valve, and a steam extraction pneumatic regulating valve are fixedly installed in sequence from right to left through a pipeline. A steam extraction valve is fixedly installed on the left side of the steam extraction pneumatic regulating valve through a pipeline, and a steam extraction check valve is fixedly installed on the left side of the steam extraction valve through a pipeline.

[0021] The working principle of the present utility model is as follows: First, by gradually adjusting the minimum opening of the rotating baffle inside the steam turbine from 20% to 10% (at this time, the maximum steam extraction volume is 65 t / h), 5% (at this time, the maximum steam extraction volume is 70 t / h), and finally restricting the minimum opening of the rotating baffle to 3.5% considering safety and economy comprehensively, the maximum steam extraction volume of the steam turbine is gradually increased from 56.5 t / h to 78 t / h, effectively improving the efficiency of the steam turbine and saving natural gas consumption. The coal consumption of the unit at the best operating condition is only 194 g / kwh. Second, by adding water outlet holes to the condensate replenishing pipe of the condenser, the maximum hourly replenishing water volume of the condenser is increased from the original 70 t / h to 85 t / h, effectively ensuring the heating water supply.

[0022] Importantly, it should be noted that the construction and arrangement of the present application shown in multiple different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who refer to this disclosure should easily understand that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application (for example, changes in the dimensions, scales, structures, shapes and proportions of various elements, as well as parameter values (such as temperature, pressure, etc.), installation arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Accordingly, all such modifications are intended to be included within the scope of the present utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any clause of "means-plus-function" is intended to cover the structure that performs the recited function herein, and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present utility model. Therefore, the present utility model is not limited to a particular embodiment, but extends to various modifications that still fall within the scope of the appended claims.

[0023] In addition, in order to provide a concise description of the exemplary embodiments, not all features of the actual embodiments may be described (i.e., those features that are not relevant to the currently contemplated best mode of carrying out the present utility model or those features that are not relevant to the implementation of the present utility model).

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit the protection scope of the present utility model. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model may be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present utility model.

Claims

1. An economical combined cycle unit heating system, comprising a steam turbine, characterized in that: A condenser is fixedly installed at the lower end of the right side of the steam turbine through a pipeline, a drain expansion tank is fixedly installed at the left side of the condenser through a pipeline, a high-pressure main steam valve bypass temperature and pressure reducer rear pipeline is fixedly installed at the left end of the top of the condenser through a pipeline, a main steam drain pipe, a high-pressure main steam liquid regulating valve and a high-pressure main steam hydraulic valve are fixedly installed in sequence from right to left at the lower end of the left side of the steam turbine through pipelines, a low-pressure intake valve rear drain pipe, a low-pressure supplementary steam pneumatic valve, a low-pressure intake valve front drain pipe and a low-pressure supplementary steam pneumatic regulating valve are fixedly installed in sequence from right to left at the right end of the top of the steam turbine through pipelines, and a low-pressure bypass pneumatic regulating valve is fixedly installed at the right end of the top of the condenser through a pipeline.

2. The economical combined cycle unit heating system according to claim 1, characterized in that: A main steam regulating valve housing drain pipe is fixedly installed at the bottom of the high-pressure main steam liquid regulating valve.

3. The economical combined cycle unit heating system according to claim 1, characterized in that: A cylinder front drain pipe is fixedly installed at the left end of the bottom of the steam turbine, and a cylinder rear drain pipe is fixedly installed at the right end of the bottom of the steam turbine. The number of the cylinder rear drain pipes is three.

4. The economical combined cycle unit heating system according to claim 1, characterized in that: A high-pressure bypass pneumatic regulating valve is fixedly installed between the left side of the high-pressure main steam valve bypass temperature and pressure reducer rear pipeline and the left side of the high-pressure main steam hydraulic valve through a pipeline.

5. The economical combined cycle unit heating system according to claim 1, characterized in that: A low-pressure main steam bypass temperature and pressure reducing device front drain pipe is fixedly installed between the left side of the low-pressure bypass pneumatic regulating valve and the left side of the low-pressure supplementary steam pneumatic regulating valve through a pipeline.

6. The economical combined cycle unit heating system according to claim 1, characterized in that: The middle end of the top of the steam turbine is fixedly installed with a steam extraction safety valve, a steam extraction check valve front drain pipe, a steam extraction electric check valve, a steam extraction quick closing valve front drain pipe, a steam extraction pneumatic quick closing valve and a steam extraction pneumatic regulating valve from right to left through a pipeline.

7. The economical combined cycle unit heating system according to claim 6, characterized in that: A steam extraction valve is fixedly installed on the left side of the steam extraction pneumatic regulating valve via a pipeline, and a steam extraction check valve is fixedly installed on the left side of the steam extraction valve via a pipeline.

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