A unit in deep peak regulation condition industrial extraction steam and hot air coupling thermal system

Abstract

The utility model relates to the flexible operation reconstruction technical field of thermal power generating unit, disclose a kind of industrial steam extraction and hot air coupling thermodynamic system under the condition of depth peak shaving of unit, including boiler, airflow ejector and industrial user or heat user, the inside of the boiler is provided with superheated steam system, the inside right side of the boiler is provided with reheat steam system, the inside right side middle part of the boiler is provided with economizer, the left and right sides of the boiler are all communicated with combustion air box.The utility model in the present application, by extracting high-quality parameter steam as ejector steam under low load, extract lower quality parameter steam as the ejector steam, mixed into the mixed steam of required parameter after airflow ejector;Effectively solve the problem that industrial steam extraction parameter is lower than user requirement index or high energy consumption after satisfying industrial steam extraction parameter by using main steam desuperheating and pressure reducing, improve industrial steam extraction capacity, and economic effect is obvious.

Description

Technical Field

[0001] This utility model relates to the field of mold repair technology, and in particular to a thermal system for coupling industrial steam extraction and hot air under deep peak shaving conditions. Background Technology

[0002] In recent years, the country has vigorously promoted the development and utilization of new energy sources, and the energy structure is gradually shifting from traditional energy dominance to diversified and coordinated development. This transformation has restricted the development of thermal power to a certain extent, and some regions have even experienced a serious overcapacity of thermal power. Against this backdrop, in order to adapt to the adjustment of the energy pattern, it has become an inevitable trend for thermal power units to continue to operate at low loads or perform deep peak shaving in the next few years.

[0003] Currently, industrial steam extraction for thermal power units typically comes from second-stage extraction (cold section reheat steam) or fourth-stage extraction (auxiliary steam). However, under low-load conditions, the pressure of these extracted steams drops significantly, making it difficult to meet the needs of industrial users. To ensure the steam demand of industrial users, high-quality main steam must be supplied through desuperheating and pressure reduction. This method not only causes serious energy waste but also leads to a sharp increase in coal consumption for power generation. At the same time, when the boiler unit operates at low load, the unit's combustion efficiency decreases, and both the main steam temperature and reheat steam temperature are low. These conditions further exacerbate the increase in coal consumption for power generation, thereby reducing the practicality of the device. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a coupled industrial steam extraction and hot air thermal system for a generator unit under deep peak shaving conditions, aiming to improve the problem of reduced combustion efficiency of the generator unit under deep peak shaving conditions in the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a thermal system for coupling industrial steam extraction and hot air under deep peak shaving conditions, comprising a boiler, an airflow ejector device, and an industrial user or heat user. The boiler is equipped with a superheated steam system, and a reheated steam system is provided on the right side of the boiler. An economizer is provided in the middle of the right side of the boiler. Combustion air boxes are connected to both the left and right sides of the boiler. A main steam pipe is connected to the top of the superheated steam system. One end of the main steam pipe is connected to the high-pressure cylinder of the steam turbine. A cold section reheated steam pipe is connected to the right side of the reheated steam system. One end of the cold section reheated steam pipe is connected to the hot section reheated steam pipe.

[0006] As a further description of the above technical solution:

[0007] The right side of the airflow ejector is connected to an inlet steam pipe, one end of which is connected to a combustion air heat exchanger. The top of the airflow ejector is connected to a second steam extraction pipe, and an isolation regulating valve is installed on the outside of the second steam extraction pipe. One end of the second steam extraction pipe is connected to a cold section reheat steam pipe. The left end of the airflow ejector is connected to a first steam extraction pipe, and an isolation regulating valve is installed on the outside of the first steam extraction pipe. One end of the first steam extraction pipe is connected to a main steam pipe.

[0008] As a further description of the above technical solution:

[0009] The right side of the combustion air heat exchanger is connected to a steam extraction pipe. A check valve is installed on the left side of the outer wall of the steam extraction pipe, and an adjustment isolation valve is installed on the right side of the outer wall of the steam extraction pipe. The right end of the steam extraction pipe is connected to an industrial user or a heat user.

[0010] As a further description of the above technical solution:

[0011] The top of the reheat steam system is connected to a hot section reheat steam pipeline, one end of which is connected to the intermediate pressure cylinder of the steam turbine, the right side of which is connected to an exhaust steam pipeline, and the bottom end of which is connected to a filter device.

[0012] As a further description of the above technical solution:

[0013] The bottom of the combustion air heat exchanger is connected to an outlet hot air pipe, and one end of the outlet hot air pipe is connected to the corresponding combustion air box.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, high-quality steam is extracted as ejector steam under low load, and lower-quality steam is extracted as the ejected steam. The amount of steam extracted is determined according to the mixed steam parameters. The steam is mixed into mixed steam with the required parameters by the airflow ejector device. The mixed steam is then used to heat the boiler combustion air, thereby improving the quality of the combustion air. This increases the temperature of the combustion air entering the boiler under low load conditions, improves the boiler's low-load stable combustion capability, improves combustion efficiency, and reduces coal consumption for power supply.

[0016] 2. In this utility model, the main steam entering the coupled thermal system does not enter the high-pressure cylinder of the steam turbine to do work, which increases the temperature of the main steam under low load. The cold section reheat steam entering the coupled thermal system does not enter the boiler reheater for heating, which increases the temperature of the cold section reheat steam. This solves the problem of low temperature of main steam and reheat steam under low load, and improves electrical load capacity and thermal economy.

[0017] 3. In this utility model, the steam after heat exchange is sent to industrial users or heat users, which improves the industrial steam extraction capacity of low-load units, realizes the decoupling of the unit's industrial steam supply problem from heat and electricity, reduces the unit's coal consumption rate for power supply, and realizes the cascade utilization of unit energy and efficient industrial heating. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of a thermal system for coupling industrial steam extraction and hot air under deep peak shaving conditions proposed in this utility model.

[0019] Legend:

[0020] 1. Boiler; 2. Superheated steam system; 3. Reheat steam system; 4. Economizer; 5. Combustion air box; 6. Isolation regulating valve one; 7. High-pressure cylinder of steam turbine; 8. Intermediate-pressure cylinder of steam turbine; 9. Isolation regulating valve two; 10. Air jet device; 11. Combustion air heat exchanger; 12. Check valve; 13. Regulating isolation valve three; 14. Industrial user or heat user; 15. Filtration device; 16. Main steam pipeline; 17. Hot section reheat steam pipeline; 18. Cold section reheat steam pipeline; 19. Steam extraction pipeline one; 20. Steam extraction pipeline two; 21. Inlet steam pipeline; 22. Extraction steam pipeline; 23. Exhaust steam pipeline; 24. Outlet hot air pipeline. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figure 1 The present invention provides an embodiment of an industrial steam extraction and hot air coupling thermal system for a unit under deep peak shaving conditions, comprising a boiler 1, an airflow ejector device 10, and an industrial user or heat user 14. The boiler 1 is equipped with a superheated steam system 2, a reheated steam system 3 is provided on the right side of the boiler 1, an economizer 4 is provided in the middle of the right side of the boiler 1, and combustion air boxes 5 are connected to both the left and right sides of the boiler 1. The top of the superheated steam system 2 is connected to a main steam pipe 16, one end of the main steam pipe 16 is connected to a high-pressure cylinder 7 of a steam turbine, and the right side of the reheated steam system 3 is connected to a cold section reheated steam pipe 18, one end of the cold section reheated steam pipe 18 is connected to a hot section reheated steam pipe 17.

[0023] An inlet steam pipe 21 is connected to the right side of the airflow ejector device 10. One end of the inlet steam pipe 21 is connected to the combustion air heat exchanger 11. A second steam extraction pipe 20 is connected to the top of the airflow ejector device 10. An isolation regulating valve 20 is installed on the outside of the second steam extraction pipe 20. One end of the second steam extraction pipe 20 is connected to the cold section reheat steam pipe 18. A first steam extraction pipe 19 is connected to the left end of the airflow ejector device 10. An isolation regulating valve is installed on the outside of the first steam extraction pipe 19. 16. One end of the steam extraction pipe 19 is connected to the main steam pipe 16. The bottom of the combustion air heat exchanger 11 is connected to the outlet hot air pipe 24. One end of the outlet hot air pipe 24 is connected to the corresponding combustion air box 5. The right side of the combustion air heat exchanger 11 is connected to the extraction pipe 22. A check valve 12 is installed on the left side of the outer wall of the extraction pipe 22. An adjustment isolation valve 13 is installed on the right side of the outer wall of the extraction pipe 22. The right end of the extraction pipe 22 is connected to the industrial user or heat user 14.

[0024] Specifically, the airflow ejector device 10 and the combustion air heat exchanger 11 are arranged in series. The two types of steam with different pressures are first guided and mixed by the airflow ejector device 10 to form steam with the required parameters, and then the combustion air of the boiler 1 is heated. The heated combustion air is directly introduced into the boiler 1 for combustion. The combustion air heat exchanger 11 is the heat exchange element between steam and combustion air. Due to the high steam pressure and temperature, the heat exchange element adopts an integrally extruded finned tube. The fins are integrally formed with the base tube. The fins can be spiral, nail-shaped, needle-shaped, etc.

[0025] The top of the reheat steam system 3 is connected to a hot section reheat steam pipe 17, one end of the hot section reheat steam pipe 17 is connected to a turbine intermediate pressure cylinder 8, the right side of the turbine intermediate pressure cylinder 8 is connected to an exhaust pipe 23, and the bottom end of the exhaust pipe 23 is connected to a filter device 15.

[0026] Specifically, the filtration device 15 can filter the discharged gas to prevent internal impurities from polluting the outside world, thereby improving the practicality of the device.

[0027] Working Principle: When boiler 1 encounters low-load operating conditions, the system actively extracts high-quality steam as injecting steam and simultaneously extracts steam with relatively lower parameters as the main injecting steam. The extraction amounts of these two types of steam are not arbitrarily determined but are precisely calculated and adjusted according to the required steam parameters after mixing. Subsequently, these two steam streams enter a dedicated airflow injection device 10, where they are thoroughly mixed to form mixed steam that meets specific parameter requirements. The primary task of this mixed steam is to heat the combustion air of boiler 1. Through this step, the quality of the combustion air is significantly improved. This measure is particularly effective when boiler 1 is operating at low load. This is particularly important under operating conditions because it effectively increases the temperature of the combustion air entering boiler 1, thereby significantly enhancing the stable combustion capability of boiler 1 under low load conditions. This not only helps to improve combustion efficiency, but also further reduces coal consumption during power supply. The steam after heat exchange is not wasted, but is transported to industrial users or heat users 14 to continue to play its thermal energy value. This measure not only improves the industrial steam extraction capacity of the low-load unit, but also successfully achieves the goal of decoupling the unit's industrial steam supply and heat and power, effectively reducing the unit's coal consumption rate for power supply. More importantly, this process realizes the cascade utilization of the unit's energy and efficient industrial heating, improving the overall energy utilization efficiency.

[0028] Furthermore, in the coupled thermodynamic system, the main steam that should have entered the high-pressure cylinder 7 of the steam turbine to perform work did not enter under these circumstances, but was instead used for other thermodynamic processes. This undoubtedly increased the temperature of the main steam under low load. Similarly, the cold section reheat steam that should have entered the reheater of boiler 1 for heating was not sent to the reheater. This series of measures effectively solved the problem of low temperatures of main steam and reheat steam under low load conditions, which not only improved the electrical load capacity, but also further improved the thermal economy of the system, providing a strong guarantee for the efficient and stable operation of boiler 1.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A thermal system for coupling industrial steam extraction and hot air under deep peak shaving conditions, comprising a boiler (1), a gas ejector device (10), and an industrial user or heat user (14), characterized in that: The boiler (1) is equipped with a superheated steam system (2) inside, a reheated steam system (3) is provided on the right side inside the boiler (1), an economizer (4) is provided in the middle of the right side inside the boiler (1), and a combustion air box (5) is connected to both the left and right sides of the boiler (1). The top of the superheated steam system (2) is connected to a main steam pipe (16), one end of the main steam pipe (16) is connected to a high-pressure cylinder of a steam turbine (7), the right side of the reheated steam system (3) is connected to a cold section reheated steam pipe (18), and one end of the cold section reheated steam pipe (18) is connected to a hot section reheated steam pipe (17).

2. The industrial steam extraction and hot air coupled thermodynamic system of claim 1, wherein: The right side of the airflow ejector device (10) is connected to an inlet steam pipe (21), one end of which is connected to a combustion air heat exchanger (11). The top of the airflow ejector device (10) is connected to a second steam extraction pipe (20). An isolation regulating valve (9) is provided on the outside of the second steam extraction pipe (20). One end of the second steam extraction pipe (20) is connected to a cold section reheat steam pipe (18). The left end of the airflow ejector device (10) is connected to a first steam extraction pipe (19). An isolation regulating valve (6) is provided on the outside of the first steam extraction pipe (19). One end of the first steam extraction pipe (19) is connected to a main steam pipe (16).

3. The industrial steam extraction and hot air coupled thermodynamic system of claim 2, wherein: The right side of the combustion air heat exchanger (11) is connected to a steam extraction pipe (22). A check valve (12) is provided on the left side of the outer wall of the steam extraction pipe (22). An adjustment isolation valve (13) is provided on the right side of the outer wall of the steam extraction pipe (22). The right end of the steam extraction pipe (22) is connected to an industrial user or a heat user (14).

4. The industrial steam extraction and hot air coupled thermodynamic system of claim 1, wherein: The top of the reheat steam system (3) is connected to a hot section reheat steam pipe (17), one end of the hot section reheat steam pipe (17) is connected to a turbine intermediate pressure cylinder (8), the right side of the turbine intermediate pressure cylinder (8) is connected to an exhaust pipe (23), and the bottom end of the exhaust pipe (23) is connected to a filter device (15).

5. The industrial steam extraction and hot air coupled thermodynamic system of claim 2, wherein: The bottom of the combustion air heat exchanger (11) is connected to an outlet hot air pipe (24), and one end of the outlet hot air pipe (24) is connected to the corresponding combustion air box (5).

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