Mixed type condenser bypass heat supply system and method

Abstract

The invention relates to the technical field of generator set heat supply, and discloses a mixed type condenser bypass heat supply system and method.The heat supply system comprises a mixed type condenser, a bypass control valve set, a condensate pump and an initial station heat exchanger; the bypass control valve set comprises a mixed type condenser steam inlet adjusting valve and a condensate pump isolating valve. A steam inlet of the mixed condenser is connected with a steam exhaust port of a steam turbine intermediate pressure cylinder through a first pipeline, and a mixed condenser steam inlet adjusting valve is arranged on the first pipeline. An outlet of the mixed condenser is connected with an inlet of the first station heat exchanger through a second pipeline, and a condensate pump isolating valve and a condensate pump are arranged on the second pipeline; an outlet of the first station heat exchanger is connected with a steam inlet of the mixed condenser through a third pipeline; the mixed type condenser is of a multi-stage inclined hole nozzle structure and is used for spraying steam into the mixed type condenser. Steam-water mixing is adopted, and the heat supply efficiency is high; the steam-water mixing ratio is adjustable, and heat supply is flexible.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat supply of generator set, and particularly relates to a hybrid condenser bypass heat supply system and method. BACKGROUND

[0002] At present, heat supply has become the core task of the generator set. The heat supply unit generally adopts a tubular heater to heat the heat network circulating water in the heat exchange pipe through steam to achieve heat supply. However, due to the limitation of the inherent heat exchange efficiency of the tubular heater, the overall heat supply efficiency of the heat supply unit is still at a low level. Such inefficient operation not only leads to energy waste, but also is difficult to meet the growing demand for heat supply, which has become a pain point that needs to be solved in the industry. Especially in the winter heating peak period, the insufficient heat supply efficiency may cause regional heat supply instability, affecting people's livelihood protection. Therefore, breaking through the existing technical bottlenecks and improving the heat supply efficiency have become the key target of optimizing operation and realizing energy saving and emission reduction of power generation enterprises.

[0003] Compared with the traditional tubular heater, the hybrid heater shows significant technical potential. Its heating efficiency is 10%-20% higher than that of the tubular heater, which can effectively improve the overall performance of the heat supply system. The hybrid condenser also has heat exchange advantages, but it has not been matched with the medium-pressure cylinder at present, which limits its large-scale application. This technical disconnection reflects the deficiency of system integration design, which becomes a key obstacle to further improve the heat supply efficiency. For example, the high-efficiency heat exchange characteristics of the hybrid condenser need to be accurately coordinated with the steam parameters of the medium-pressure cylinder, otherwise it may cause unstable system operation. SUMMARY

[0004] To solve the existing problems, the present application provides a hybrid condenser bypass heat supply system and method, which realizes the condenser bypass heat supply function through the combination of the hybrid condenser, the bypass control valve group, the condensate pump and the first station heat exchanger. The multi-stage inclined hole nozzle structure helps the steam to be sprayed more uniformly into the condenser, improving the heat exchange efficiency. The first station heat exchanger can heat the heat network circulating water with the outlet water of the condenser. This way of directly exchanging heat between the medium-pressure cylinder steam and the condensate water significantly improves the heat utilization efficiency and also improves the energy efficiency of the generator set, reducing the production cost.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme.

[0006] The application provides a mixed condenser bypass heat supply system, which comprises a mixed condenser, a bypass control valve group, a condensate pump and a first station heat exchanger; the bypass control valve group comprises a mixed condenser steam inlet adjusting valve and a condensate pump isolation valve; a steam inlet of the mixed condenser is connected with a steam outlet of a medium-pressure cylinder of a steam turbine through a first pipeline, and a mixed condenser steam inlet adjusting valve is arranged on the first pipeline; an outlet of the mixed condenser is connected with an inlet of the first station heat exchanger through a second pipeline, and a condensate pump isolation valve and a condensate pump are arranged on the second pipeline; an outlet of the first station heat exchanger is connected with the steam inlet of the mixed condenser through a third pipeline; the mixed condenser adopts a multi-stage inclined orifice nozzle structure for spraying steam into the mixed condenser.

[0007] As a further improvement of the application, the mixed condenser steam inlet adjusting valve comprises an electric adjusting valve and a pneumatic quick closing valve, wherein the electric adjusting valve is used for flow adjustment, and the pneumatic quick closing valve is used for emergency steam cut-off in case of overpressure.

[0008] As a further improvement of the application, a control system, a temperature sensor and a pressure sensor are further included; the temperature sensor is arranged at the outlet of the mixed condenser; the pressure sensor is arranged on the first pipeline; and the control system is electrically connected with the temperature sensor and the pressure sensor respectively.

[0009] As a further improvement of the application, the control system is electrically connected with the electric adjusting valve and the pneumatic quick closing valve respectively.

[0010] As a further improvement of the application, the pressure sensor adopts a diffused silicon pressure transmitter.

[0011] As a further improvement of the application, the temperature sensor has a plurality of temperature sensors, one of which is arranged on the third pipeline.

[0012] As a further improvement of the application, a deaerator and a condensate-to-deaerator booster pump are further included; an outlet of the mixed condenser is connected with an inlet of the deaerator through a fourth pipeline, and the condensate-to-deaerator booster pump is arranged on the fourth pipeline.

[0013] As a further improvement of the application, a deaerator isolation valve is further included, and the deaerator isolation valve is arranged on the fourth pipeline.

[0014] As a further improvement of the application, an outlet of the medium-pressure cylinder of the steam turbine is connected with a steam inlet of a low-pressure cylinder through a fifth pipeline, and a steam turbine low-pressure cylinder steam inlet adjusting valve is arranged on the fifth pipeline.

[0015] The application further provides a mixed condenser bypass heat supply method, which comprises the following steps: Part or all of the exhaust steam from the intermediate-pressure cylinder of the steam turbine enters the mixing condenser through the first pipeline; part or all of the exhaust steam from the intermediate-pressure cylinder of the steam turbine enters the low-pressure cylinder of the steam turbine through the fifth pipeline; part of the condensate from the mixing condenser passes through the second pipeline, undergoes heat exchange in the first-stage heat exchanger, and then returns to the mixing condenser through the third pipeline; part of the condensate from the mixing condenser returns to the deaerator through the fourth pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This system provides a well-defined and complete hybrid condenser bypass heating system. Through the combination of a hybrid condenser, bypass control valve group, condensate pump, and primary heat exchanger, it achieves condenser bypass heating functionality. The multi-stage inclined nozzle structure helps to inject steam more evenly into the condenser, improving heat exchange efficiency. The primary heat exchanger can use the outlet water from the hybrid condenser to heat the circulating water in the heating network. This method of directly exchanging heat between intermediate-pressure cylinder steam and condensate significantly improves heat utilization efficiency, enhances the energy efficiency of the generator set, and reduces production costs.

[0017] Preferably, the steam inlet regulating valve of the hybrid condenser includes an electric regulating valve and a pneumatic quick-closing valve. The electric regulating valve can accurately regulate the steam flow to meet the needs of different operating conditions; the pneumatic quick-closing valve can cut off the steam in case of overpressure, ensuring system safety and preventing equipment damage and accidents.

[0018] Preferably, the configuration of the control system, temperature sensor, and pressure sensor enables the system to monitor the condenser outlet temperature and the first pipeline pressure in real time, providing a basis for the control system's decision-making and contributing to the stable operation and automated control of the system.

[0019] Preferably, the control system is electrically connected to the electric regulating valve and the pneumatic quick-closing valve. Based on the signals fed back by the temperature sensor and the pressure sensor, it can automatically adjust the opening of the electric regulating valve to control the steam flow and quickly close the pneumatic quick-closing valve when there is overpressure, thereby improving the system's response speed and control accuracy and ensuring the safe and efficient operation of the system.

[0020] Preferably, a diffused silicon pressure transmitter is used as the pressure sensor, which has the advantages of high measurement accuracy, good stability and fast response speed. It can measure the pressure of the first pipeline more accurately and provide reliable data for the precise control of the control system.

[0021] Preferably, multiple temperature sensors are installed, with one on the third pipeline. This allows for more comprehensive monitoring of the temperature at different locations in the system, especially the temperature of the third pipeline. This helps to more accurately grasp the temperature of the circulating water in the heating network, providing richer information for the control system and improving the system's control performance.

[0022] Preferably, a deaerator and a condensate-to-deaerator booster pump are added. The condensate from the outlet of the mixed condenser can be transported to the deaerator for deoxygenation treatment via the condensate-to-deaerator booster pump to remove oxygen and other gases from the water, prevent equipment corrosion, and improve the reliability and service life of the system.

[0023] Preferably, a deaerator isolation valve is provided, which can cut off the fluid passage of the fourth pipeline when needed, facilitating the inspection, maintenance or isolation of the deaerator and improving the system's flexibility and maintainability.

[0024] Preferably, the steam inlet of the hybrid condenser is connected to the exhaust port of the low-pressure cylinder through a fifth pipeline, and a steam inlet regulating valve for the hybrid condenser is installed. This can make full use of the heat from the exhaust steam of the low-pressure cylinder, further expand the heat supply sources of the system, and improve energy efficiency.

[0025] Preferably, this method involves direct heat exchange between the exhaust steam from the intermediate-pressure cylinder of the steam turbine and the circulating water in the heating network through a mixing condenser. The circulating water is then reheated by the primary heat exchanger, achieving a highly efficient heating process. Direct contact heat exchange improves heat exchange efficiency, and secondary heating further meets the heating network's water temperature requirements, ensuring heating quality. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a schematic diagram of a hybrid condenser bypass heating system in Example 1; Figure 2 This is a schematic diagram of a hybrid condenser bypass heating system in Example 2; Figure 3 This is a flowchart illustrating the steps of a hybrid condenser bypass heating method in Example 1.

[0027] The components are as follows: 1. Intermediate-pressure cylinder of the steam turbine; 2. Steam inlet regulating valve of the mixed condenser; 3. Mixed condenser; 4. Deaerator; 5. Condensate to deaerator booster pump; 6. Condensate to deaerator isolation valve; 7. Condensate pump isolation valve; 8. Condensate pump; 9. First-stage heat exchanger; 10. Low-pressure cylinder; 11. Low-pressure cylinder steam inlet regulating valve; 12. First pipeline; 13. Second pipeline; 14. Third pipeline; 15. Fourth pipeline; 16. Fifth pipeline. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0029] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Example 1 This embodiment provides a hybrid condenser bypass heating system, including an intermediate-pressure cylinder and a low-pressure cylinder 10 in a generator set, comprising a hybrid condenser 3, a bypass control valve group, a condensate pump 8, a primary heat exchanger 9, a control system, temperature sensors, pressure sensors, a deaerator 4, and a condensate-to-deaerator booster pump 5; the bypass control valve group includes a hybrid condenser inlet steam regulating valve 2 and a condensate pump isolation valve 7; the steam inlet of the hybrid condenser 3 is connected to the intermediate-pressure cylinder of the turbine via a first pipeline 12. The cylinder 1 exhaust port is connected, and a mixing condenser inlet regulating valve 2 is installed on the first pipeline 12; the outlet of the mixing condenser 3 is connected to the inlet of the first station heat exchanger 9 through the second pipeline 13, and a condensate pump isolation valve 7 and a condensate pump 8 are installed on the second pipeline 13; the outlet of the first station heat exchanger 9 is connected to the steam inlet of the mixing condenser 3 through the third pipeline 14; the mixing condenser 3 adopts a multi-stage inclined nozzle structure for injecting steam into the mixing condenser 3.

[0032] The outlet of the hybrid condenser is connected to the inlet of the deaerator 4 via a fourth pipeline 15, and a condensate booster pump 5 for the deaerator is installed on the fourth pipeline 15. A condensate isolation valve 6 for the deaerator is also installed on the fourth pipeline 15.

[0033] Specifically, such asFigure 1 As shown, the inlets of the mixing condenser inlet regulating valve 2 and the low-pressure cylinder inlet regulating valve 11 are connected to the exhaust port of the turbine intermediate-pressure cylinder 1 through pipelines; the outlet of the mixing condenser inlet regulating valve 2 is connected to the inlet of the mixing condenser 3 through pipelines; and the outlet of the low-pressure cylinder inlet regulating valve 11 is connected to the inlet of the low-pressure cylinder 10 through pipelines.

[0034] The inlets of condensate to deaerator isolation valve 6 and condensate pump isolation valve 7 are connected to the outlet of mixing condenser 3 via pipelines; the outlet of condensate to deaerator isolation valve 6 is connected to the inlet of condensate to deaerator booster pump 5 via pipelines, and the outlet of condensate to deaerator booster pump 5 is connected to deaerator 4 via pipelines; the outlet of condensate pump isolation valve 7 is connected to the inlet of condensate pump 8 via pipelines.

[0035] The condensate inlet of the first heat exchanger 9 is connected to the outlet of the condensate pump 8; the condensate outlet of the first heat exchanger 9 is connected to the condensate nozzle at the top of the mixing condenser 3.

[0036] The hybrid condenser inlet steam regulating valve 2 includes an electric regulating valve and a pneumatic quick-closing valve, wherein the electric regulating valve is used for flow regulation and the pneumatic quick-closing valve is used for emergency steam cut-off in case of overpressure.

[0037] The temperature sensor is located at the outlet of the hybrid condenser 3; the pressure sensor is located on the first pipeline 12; and the control system is electrically connected to the temperature sensor and the pressure sensor respectively.

[0038] The control system is electrically connected to the electric regulating valve and the pneumatic quick-closing valve, respectively.

[0039] The pressure sensor is a diffused silicon pressure transmitter.

[0040] There are several temperature sensors, one of which is installed on the third pipe 14.

[0041] like Figure 3 As shown, this embodiment provides a method for bypassing heating in a hybrid condenser. The first step is to introduce part or all of the exhaust steam from the condenser's pressure cylinder into the hybrid condenser through a first pipeline. The second step is to directly exchange heat between the steam and the circulating heated condensate. The third step is to use the condensate after heat exchange to heat the circulating water of the heating network in the first-station heat exchanger.

[0042] The method of using the hybrid condenser bypass heating system described in this embodiment is as follows: During the heating season, open the mixing condenser inlet steam regulating valve 2 and the low-pressure cylinder inlet steam regulating valve 11, and open the condensate to deaerator isolation valve 6 and the condensate pump isolation valve 7. Maintain the opening degree of the low-pressure cylinder inlet steam regulating valve 11 and the frequency of the condensate pump 8, and control the condensate temperature between 80-120℃ by adjusting the opening degree of the mixing condenser inlet steam regulating valve 2. When the temperature is lower than the set value, increase the opening degree of the mixing condenser inlet steam regulating valve 2; when the temperature is higher than the set value, decrease the opening degree of the mixing condenser inlet steam regulating valve 2.

[0043] During the heating period, the condensate level in the hybrid condenser 3 is monitored to maintain a stable level and ensure heating effect. When the condensate level is higher than the set value, the frequency of the condensate to deaerator booster pump 5 is increased. When the condensate level is lower than the set value, the frequency of the condensate to deaerator booster pump 5 is decreased.

[0044] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) The steam inlet of the hybrid condenser is connected to the exhaust port of the low-pressure cylinder through the fifth pipeline, and the fifth pipeline is equipped with a steam inlet regulating valve for the hybrid condenser.

[0045] like Figure 2 As shown, the steam inlet of the hybrid condenser 3 is connected to the exhaust port of the low-pressure cylinder through the fifth pipeline 16, and a hybrid condenser inlet regulating valve 2 is installed. This can make full use of the heat from the exhaust steam of the low-pressure cylinder 10, further expand the heat supply source of the system, and improve the energy utilization rate.

[0046] In a mixed condenser, steam and condensate exchange heat directly; the heat supply can be adjusted by regulating the opening of the turbine low-pressure cylinder inlet regulating valve and the mixed condenser inlet regulating valve; and the condensate level in the condenser can be kept stable by adjusting the flow rate of condensate to the deaerator booster pump and the condensate pump.

[0047] The above embodiments are merely one of the implementation methods for achieving the technical solution of the present invention. The scope of protection claimed by the present invention is not limited to this embodiment, but also includes any variations, substitutions and other implementation methods that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention.

Claims

1. A hybrid condenser bypass heating system, comprising a turbine intermediate-pressure cylinder (1) and a low-pressure cylinder (10) in a generator set, characterized in that, The system includes a hybrid condenser (3), a bypass control valve group, a condensate pump (8), and a primary heat exchanger (9). The bypass control valve group includes a hybrid condenser inlet regulating valve (2) and a condensate pump isolation valve (7). The steam inlet of the hybrid condenser (3) is connected to the exhaust port of the intermediate pressure cylinder (1) of the turbine through a first pipeline (12), and the hybrid condenser inlet regulating valve (2) is installed on the first pipeline (12). The outlet of the hybrid condenser (3) is connected to the inlet of the primary heat exchanger (9) through a second pipeline (13), and the condensate pump isolation valve (7) and the condensate pump (8) are installed on the second pipeline (13). The outlet of the primary heat exchanger (9) is connected to the steam inlet of the hybrid condenser (3) through a third pipeline (14). The hybrid condenser (3) adopts a multi-stage inclined nozzle structure to inject steam into the hybrid condenser (3).

2. The hybrid condenser bypass heating system according to claim 1, characterized in that, The hybrid condenser inlet steam regulating valve (2) includes an electric regulating valve and a pneumatic quick-closing valve, wherein the electric regulating valve is used for flow regulation and the pneumatic quick-closing valve is used for emergency steam cut-off in case of overpressure.

3. A hybrid condenser bypass heating system according to claim 2, characterized in that, It also includes a control system, a temperature sensor and a pressure sensor; the temperature sensor is located at the outlet of the hybrid condenser (3); the pressure sensor is located on the first pipeline (12); the control system is electrically connected to the temperature sensor and the pressure sensor respectively.

4. A hybrid condenser bypass heating system according to claim 3, characterized in that, The control system is electrically connected to the electric regulating valve and the pneumatic quick-closing valve, respectively.

5. A hybrid condenser bypass heating system according to claim 3, characterized in that, The pressure sensor is a diffused silicon pressure transmitter.

6. A hybrid condenser bypass heating system according to claim 3, characterized in that, There are several temperature sensors, one of which is located on the third pipe (14).

7. A hybrid condenser bypass heating system according to claim 1, characterized in that, It also includes a deaerator (4) and a condensate to deaerator booster pump (5); the outlet of the mixed condenser (3) is connected to the inlet of the deaerator (4) through a fourth pipeline (15), and a condensate to deaerator booster pump (5) is installed on the fourth pipeline (15).

8. A hybrid condenser bypass heating system according to claim 7, characterized in that, It also includes a condensate to deaerator isolation valve (6), which is installed on the fourth pipeline (15).

9. A hybrid condenser bypass heating system according to claim 1, characterized in that, The outlet of the intermediate pressure cylinder (1) of the steam turbine is connected to the steam inlet of the low pressure cylinder (10) through the fifth pipeline (16), and the steam inlet regulating valve (11) of the low pressure cylinder of the steam turbine is provided on the fifth pipeline (16).

10. A method for bypass heating of a hybrid condenser as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Part or all of the exhaust steam from the intermediate pressure cylinder (1) of the steam turbine enters the mixing condenser (3) through the first pipeline (12); Part or all of the exhaust steam from the intermediate pressure cylinder (1) of the steam turbine enters the low pressure cylinder (10) of the steam turbine through the fifth pipeline (16). Part of the condensate from the hybrid condenser (3) is heat-exchanged through the first heat exchanger (9) via the second pipeline (13), and then returns to the hybrid condenser (3) via the third pipeline (14). Part of the condensate from the hybrid condenser (3) returns to the deaerator (4) through the fourth pipeline (15).

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