A system for recovering surplus saturated steam

Abstract

This utility model relates to the field of steam utilization equipment technology, and discloses a surplus saturated steam recovery and utilization system, including a boiler, a first dehumidifier, a second dehumidifier, a steam turbine, a steam-water separator reheater, a generator, and a condensate recirculation mechanism. The boiler has a high-pressure chamber and a low-pressure chamber, with the steam pressure in the high-pressure chamber being greater than that in the low-pressure chamber. The high-pressure chamber is connected sequentially to the first dehumidifier and the steam turbine. The steam turbine is connected to the steam-water separator reheater to form a dehumidification and reheating loop. The low-pressure chamber is connected in two paths, one of which is connected to the steam-water separator reheater, and the other is connected sequentially to the second dehumidifier and the steam turbine. The steam turbine is connected to the generator. The condensate recirculation mechanism is connected to both the steam turbine and the boiler, and is used to condense the steam discharged from the steam turbine and recover it for transport to the boiler. This utility model is beneficial for improving the utilization rate of surplus saturated steam and for increasing power generation efficiency and capacity.

Description

Technical Field

[0001] This utility model relates to the field of steam utilization equipment technology, specifically to a surplus saturated steam recovery and utilization system. Background Technology

[0002] In metallurgical and chemical production processes, two or more surplus steam streams with different pressures are typically generated. These surplus steam streams are usually low-grade steam with pressures below medium pressure and temperatures below 3.43 MPa.a and temperatures below 340°C, and are often in a saturated steam state. Currently, only the higher-pressure surplus steam stream is typically used for waste heat power generation, while the other surplus steam streams need to be cooled, recovered, or even discharged, resulting in significant waste. Furthermore, when generating electricity using surplus steam, the steam humidity inside the turbine cannot be too high to prevent blade erosion, requiring a sacrifice in power generation efficiency to ensure the safe operation of the turbine blades. Additionally, the steam humidity limitation restricts the upper limit of the inlet steam pressure without dehumidification. Currently, the highest saturated steam inlet pressure without dehumidification is approximately 3.5 MPa.a, thus limiting the turbine's power generation capacity. Existing surplus saturated steam power generation projects all have a maximum power output of no more than 30 MW. Utility Model Content

[0003] The technical objective of this utility model is to address the shortcomings of the prior art by providing a surplus saturated steam recovery and utilization system that is beneficial for improving the utilization rate of surplus saturated steam and for increasing power generation efficiency and capacity.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A system for recovering and utilizing surplus saturated steam includes a boiler, a first dehumidifier, a second dehumidifier, a steam turbine, a steam-water separator reheater, a generator, and a condensate recirculation mechanism.

[0006] The boiler has a high-pressure chamber and a low-pressure chamber, wherein the steam pressure in the high-pressure chamber is greater than the steam pressure in the low-pressure chamber.

[0007] The high-pressure chamber is connected in sequence to the first dehumidifier and the steam turbine via pipelines;

[0008] The steam turbine and the steam-water separator reheater are connected by a pipeline to form a dehumidification and reheating circuit;

[0009] The low-pressure chamber is connected in two ways. One way is connected to the steam-water separator reheater via a pipeline, and the other way is connected to the second dehumidifier and the steam turbine in sequence via a pipeline.

[0010] The steam turbine is connected to the generator;

[0011] The condensate recirculation mechanism is connected to the steam turbine and the boiler via pipelines. The condensate recirculation mechanism is used to condense the steam discharged from the steam turbine and recover it for transport to the boiler.

[0012] In the above-mentioned technical measures, the steam generated in the high-pressure chamber of the boiler is dehumidified by the first dehumidifier and then enters the turbine to drive the generator to generate electricity. The steam generated in the low-pressure chamber of the boiler is divided into two streams. One stream enters the steam-water separator reheater to heat the dehumidified steam, and the other stream enters the turbine to drive the generator to generate electricity after being dehumidified by the second dehumidifier. The turbine and the steam-water separator reheater are connected by pipelines to form a dehumidification and reheating loop. This allows the steam that is doing work in the turbine to enter the steam-water separator reheater for dehumidification and heating when it reaches a certain humidity. After heating, it returns to the turbine to continue doing work. After the steam has done its work, it is discharged through the turbine and recycled using the condensate recirculation mechanism. The steam is then transported back to the boiler, thus achieving recovery.

[0013] The aforementioned technical measures can simultaneously utilize both high-pressure and low-pressure steam from the surplus steam generated by the boiler, which is beneficial for improving the utilization rate of surplus steam and effectively reducing resource waste. By using an external steam-water separator reheater to dehumidify and heat the steam, it is beneficial for avoiding water erosion of the turbine blades, improving the power generation efficiency of the turbine, and ensuring that the steam inlet pressure is not limited by the steam humidity, which is beneficial for increasing the power generation capacity of the turbine. By using a condensate recirculation mechanism to transport condensate to the boiler, the emission of surplus steam is reduced, which is beneficial for improving resource utilization and reducing environmental pollution.

[0014] Furthermore, the pipeline connecting the first dehumidifier to the steam turbine is equipped with a main steam valve and a regulating valve.

[0015] The above-mentioned technical measures, by setting the main steam valve and regulating valve, can effectively control the steam flow and pressure entering the steam turbine, and at the same time, can cut off the steam flow channel in a timely manner, which helps to ensure that the steam turbine operates under safe and stable conditions and improves its operational reliability and stability.

[0016] Furthermore, in the dehumidification and reheating circuit formed by the steam turbine and the steam-water separator reheater, a quick-shut-off valve is provided on the pipeline from the steam-water separator reheater to the steam turbine.

[0017] The above-mentioned technical measures, by setting up a fast shut-off valve, can promptly cut off the steam flow channel in the event of an accident, which helps to improve the safety of turbine operation.

[0018] Furthermore, the pipeline connecting the second dehumidifier to the steam turbine is equipped with a steam injection valve and a steam injection regulating valve.

[0019] The above-mentioned technical measures, by setting up a steam injection valve and a steam injection regulating valve, can effectively control the steam flow and pressure entering the steam turbine, and at the same time, can cut off the steam flow channel in a timely manner, which helps to ensure that the steam turbine operates under safe and stable conditions, and improves operational reliability and flexibility.

[0020] Furthermore, a regulating valve is provided on the pipe connecting the low-pressure chamber of the boiler to the steam-water separator reheater.

[0021] The above-mentioned technical measures, by setting up regulating valves, can effectively control the steam flow rate entering the steam-water separator reheater for heating, and can be flexibly adjusted according to the operating conditions and needs of the steam-water separator reheater.

[0022] Furthermore, the condensate recirculation mechanism comprises a condenser, a condensate pump, a shaft seal heater, a deaerator, and a feedwater pump connected in sequence;

[0023] The steam turbine is connected to the condenser, and the feedwater pump is connected to the boiler;

[0024] The condenser is used to condense the steam discharged from the steam turbine into condensate; the condensate pump is used to transport the condensate to the deaerator via the shaft seal heater; the shaft seal heater is used to heat the condensate using steam leaking from the steam turbine; the deaerator is used to deoxygenate the condensate; and the feedwater pump is used to pressurize the condensate and transport it to the boiler.

[0025] The above-mentioned technical measures, through the coordinated operation of the condenser, condensate pump, shaft seal heater, deaerator and feedwater pump, can achieve steam recovery and reduce resource waste.

[0026] Furthermore, the deaerator is connected to the steam turbine via a pipeline, and the steam turbine provides steam to the deaerator.

[0027] The above-mentioned technical measures, by using a steam turbine to provide steam to the deaerator, help improve resource utilization and avoid the need for external equipment to provide steam to the deaerator.

[0028] Furthermore, the steam turbine, the first dehumidifier, the second dehumidifier, and the steam-water separator reheater are all equipped with condensate drain pipes;

[0029] The pipeline connecting the steam-water separator reheater to the steam turbine is equipped with multiple drainage pipes;

[0030] These drainage pipes are each connected to the same drainage expansion container, which is connected to a desuperheating water spray pipe used to spray water into the drainage expansion container; the drainage expansion container is connected to the hot well and throat of the condenser respectively.

[0031] The above-mentioned technical measures collect the condensate generated by equipment such as steam turbines, dehumidifiers, and steam-water separators into a condensate expansion tank by setting up multiple condensate drainage pipes. Water is then sprayed into the condensate expansion tank through desuperheating spray pipes to achieve cooling and pressure reduction. The condensate expansion tank is connected to the hot well and throat of the condenser respectively, so as to transport the condensate and steam to the hot well and throat of the condenser respectively, thereby realizing the recovery of condensate and steam.

[0032] Furthermore, the surplus saturated steam recovery and utilization system also includes a first steam generator, the steam pressure generated by the first steam generator is greater than the steam pressure of the low-pressure chamber and less than the steam pressure of the high-pressure chamber, and the first steam generator is connected in sequence to a pressure reducing valve, a second dehumidifier and the steam turbine through pipelines;

[0033] The first steam generator is connected to the condensate pump via a pipeline.

[0034] The above-mentioned technical measures, by utilizing the steam generated by the first steam generator, can provide more steam for the steam turbine, which is beneficial to improving the utilization rate of surplus steam; by adjusting the steam pressure through the pressure reducing valve, the steam pressure entering the second dehumidifier is ensured to match the steam pressure in the low-pressure chamber, which is beneficial to improving operational stability; the first steam generator is connected to the condensate pump, and the condensate pump transports the condensate generated by the first steam generator back to the first steam generator, realizing resource recovery.

[0035] Furthermore, the surplus saturated steam recovery and utilization system also includes a second steam generator, the steam pressure generated by the second steam generator is lower than the steam pressure of the low-pressure chamber, and the second steam generator is connected in sequence to a surface heat exchanger and a condenser through pipelines;

[0036] The second steam generator is connected to the condensate pump via a pipeline.

[0037] The above-mentioned technical measures utilize the steam generated by the second steam generator to heat the condensate through a surface heat exchanger, which helps to improve the utilization rate of surplus steam. At the same time, the surface heat exchanger converts the steam into condensate and transports it to the condenser hot well. Then, the condensate formed by the second steam generator is transported back to the second steam generator by a condensate pump, thus realizing resource recovery.

[0038] One or more technical solutions provided by this utility model have at least the following technical effects or advantages:

[0039] In the above-mentioned technical measures, the steam generated in the high-pressure chamber of the boiler is dehumidified by the first dehumidifier and then enters the turbine to drive the generator to generate electricity. The steam generated in the low-pressure chamber of the boiler is divided into two streams. One stream enters the steam-water separator reheater to heat the dehumidified steam, and the other stream enters the turbine to drive the generator to generate electricity after being dehumidified by the second dehumidifier. The turbine and the steam-water separator reheater are connected by pipelines to form a dehumidification and reheating loop. This allows the steam that is doing work in the turbine to enter the steam-water separator reheater for dehumidification and heating when it reaches a certain humidity. After heating, it returns to the turbine to continue doing work. After the steam has done its work, it is discharged through the turbine and recycled using the condensate recirculation mechanism. The steam is then transported back to the boiler, thus achieving recovery.

[0040] The aforementioned technical measures can simultaneously utilize both high-pressure and low-pressure steam from the surplus steam generated by the boiler, which is beneficial for improving the utilization rate of surplus steam and effectively reducing resource waste. By using an external steam-water separator reheater to dehumidify and heat the steam, it is beneficial for avoiding water erosion of the turbine blades, improving the power generation efficiency of the turbine, and ensuring that the steam inlet pressure is not limited by the steam humidity, which is beneficial for increasing the power generation capacity of the turbine. By using a condensate recirculation mechanism to transport condensate to the boiler, the emission of surplus steam is reduced, which is beneficial for improving resource utilization and reducing environmental pollution. Attached Figure Description

[0041] The accompanying drawings, which are provided to further illustrate the embodiments of the present invention and constitute a part of the present invention, do not constitute a limitation thereof.

[0042] Figure 1 This is a schematic diagram of the structure of this utility model;

[0043] Figure 2 This is another structural schematic diagram of the present invention;

[0044] Among them, 1-boiler; 2-first dehumidifier; 3-second dehumidifier; 4-steam turbine; 5-steam-water separator reheater; 6-generator; 7-condenser; 8-condensate pump; 9-shaft seal heater; 10-deaerator; 11-feed water pump; 12-drainage expansion tank; 13-desuperheating spray pipe; 14-first steam generator; 15-second steam generator; 16-surface heat exchanger. Detailed Implementation

[0045] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments of this utility model and the features within them can be combined with each other.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0047] Example 1

[0048] Reference Figure 1 This embodiment provides a system for recovering and utilizing surplus saturated steam, including a boiler 1, a first dehumidifier 2, a second dehumidifier 3, a steam turbine 4, a steam-water separator reheater 5, a generator 6, and a condensate recirculation mechanism.

[0049] Boiler 1 has a high-pressure chamber and a low-pressure chamber, and the steam pressure in the high-pressure chamber is greater than the steam pressure in the low-pressure chamber.

[0050] The high-pressure chamber is connected in sequence to the first dehumidifier 2 and the steam turbine 4 via pipes;

[0051] Steam turbine 4 and steam-water separator reheater 5 are connected by pipelines to form a dehumidification and reheating circuit;

[0052] The low-pressure chamber is connected in two ways. One way is connected to the steam-water separator reheater 5 through a pipeline, and the other way is connected to the second dehumidifier 3 and the steam turbine 4 in sequence through a pipeline.

[0053] Steam turbine 4 is connected to generator 6;

[0054] The condensate recirculation mechanism is connected to the steam turbine 4 and the boiler 1 through pipelines respectively. The condensate recirculation mechanism is used to condense the steam discharged from the steam turbine 4 and recover it for transport to the boiler 1.

[0055] The first dehumidifier 2 operates within a pressure range that is compatible with the steam pressure in the high-pressure chamber; the second dehumidifier 3 operates within a pressure range that is compatible with the steam pressure in the low-pressure chamber.

[0056] The main steam valve and regulating valve are installed on the pipe connecting the first dehumidifier 2 and the steam turbine 4.

[0057] In the dehumidification and reheating circuit formed by the steam turbine 4 and the steam-water separator reheater 5, a quick shut-off valve is installed on the pipeline from the steam-water separator reheater 5 to the steam turbine 4.

[0058] The pipe connecting the second dehumidifier 3 to the steam turbine 4 is equipped with a steam injection valve and a steam injection regulating valve.

[0059] A regulating valve is installed on the pipe connecting the low-pressure chamber of boiler 1 to the steam-water separator reheater 5.

[0060] The design pressure of the valves (i.e., main steam valve, regulating valve, quick shut-off valve, make-up steam valve, and make-up steam regulating valve) on the above-mentioned pipelines is matched with the steam pressure and flow rate flowing on each pipeline.

[0061] The condensate recirculation mechanism comprises a condenser 7, a condensate pump 8, a shaft seal heater 9, a deaerator 10, and a feedwater pump 11 connected in sequence.

[0062] Steam turbine 4 is connected to condenser 7, and feedwater pump 11 is connected to boiler 1;

[0063] The condenser 7 is used to condense the steam discharged from the turbine 4 into condensate; the condensate pump 8 is used to transport the condensate to the deaerator 10 via the shaft seal heater 9; the shaft seal heater 9 is used to heat the condensate using the steam leaking from the turbine 4; the deaerator 10 is used to deoxygenate the condensate transported by the condensate pump 8; and the feedwater pump 11 is used to pressurize the condensate and transport it to the boiler 1.

[0064] The deaerator 10 is connected to the steam turbine 4 via a pipeline, and the steam turbine 4 provides steam to the deaerator 10.

[0065] Steam turbine 4, first dehumidifier 2, second dehumidifier 3 and steam-water separator reheater 5 are all equipped with condensate drain pipes;

[0066] Multiple drainage pipes are provided on the pipe connecting the steam-water separator reheater 5 and the steam turbine 4;

[0067] These drainage pipes are each connected to the same drainage expansion container 12, which is connected to a desuperheating spray pipe 13. The desuperheating spray pipe 13 is used to spray water into the drainage expansion container 12. The drainage expansion container 12 is connected to the hot well and throat of the condenser 7. The desuperheating spray pipe 13 can be externally connected to demineralized water.

[0068] Among them, such as Figure 1 As shown, LD1, LD2, LD3, LD4, LD5, LD6, LD7, LD8, and LD9 are all drainage pipes. The actual number of drainage pipes depends on actual needs.

[0069] The shaft seal heater 9 is connected to the hot well of the condenser 7. The condenser 7 is usually under negative pressure during operation. Due to the pressure difference between the shaft seal heater 9 and the condenser 7, the condensate from the shaft seal heater 9 can flow directly into the hot well of the condenser 7.

[0070] In application, the high-pressure chamber of boiler 1 generates surplus steam (i.e., main steam), and the low-pressure chamber of boiler 1 generates surplus steam (i.e., make-up steam). The main steam first passes through the first dehumidifier 2 to dehumidify it, so that the humidity of the main steam is less than 0.5%. Then it passes through the main steam valve and the regulating valve in sequence to enter the steam turbine 4 to do work, thereby driving the generator 6 to generate electricity.

[0071] The supplementary steam is divided into two streams. One stream enters the steam-water separator reheater 5 through the regulating valve, and the other stream is dehumidified through the second dehumidifier 3 to make the humidity of the low-grade steam less than 0.5%. Then, it enters the steam turbine 4 through the supplementary steam valve and the supplementary steam regulating valve in sequence, mixes with the main steam, and works together to drive the generator 6 to generate electricity. The steam introduced into the turbine 4 does work, causing the humidity to rise. When the humidity reaches a certain level (reaching a preset humidity threshold), it is discharged from the turbine 4 and enters the steam-water separator reheater 5 for dehumidification. After dehumidification, it is heated in the steam-water separator reheater using supplementary steam to increase the steam superheat. This allows the reheated steam (i.e., the dehumidified and heated steam) to enter the turbine 4 again through the quick shut-off valve to drive the generator 6 to generate electricity. The reheated steam flows in the opposite direction to the main steam and supplementary steam in the turbine 4. After the work is completed, the turbine 4 discharges the reheated steam into the condenser 7 to condense into condensate. The condensate is first sent to the shaft seal heater 9 by the condensate pump 8. The shaft seal heater 9 uses the steam leaking from the turbine 4 to heat the condensate. Finally, it enters the deaerator 10 for deoxygenation. The steam required by the deaerator 10 comes from the steam extracted from the turbine 4. Finally, the condensate is transported back to the boiler 1 by the feedwater pump 11 to complete the recovery.

[0072] During operation, the condensate from the turbine 4, the first dehumidifier 2, the second dehumidifier 3, the steam-water separator reheater 5, and the pipes flows into the condensate expansion tank 12 through the condensate pipe. Water is then sprayed into the condensate expansion tank 12 through the desuperheating spray pipe 13 to cool and depressurize the condensate. Finally, the condensate formed by the condensate expansion tank 12 is transported to the hot well of the condenser 7, and the steam formed is transported to the throat of the condenser 7. The steam is then transported back to the boiler 1 through the condensate pump 8, the shaft seal heater 9, the deaerator 10, and the feedwater pump 11 in sequence, completing the recovery.

[0073] Example 2

[0074] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0075] Reference Figure 2 The surplus saturated steam recovery and utilization system in this embodiment also includes a first steam generator 14. The steam pressure generated by the first steam generator 14 is greater than the steam pressure in the low-pressure chamber and less than the steam pressure in the high-pressure chamber. The first steam generator 14 is connected in sequence to a pressure reducing valve, a second dehumidifier 3 and a steam turbine 4 through a pipeline.

[0076] The first steam generator 14 is connected to the condensate pump 8 via a pipeline.

[0077] In application, the surplus steam generated by the first steam generator 14 (referred to as surplus steam one) is reduced to the working pressure range of the second dehumidifier 3 by the pressure reducing valve. Then, it is dehumidified by the second dehumidifier 3 and then enters the steam turbine 4 to drive the generator 6 to generate electricity. After the work is completed, the steam turbine 4, together with the main steam, the make-up steam and the surplus steam one, is discharged at the same time. The condenser 7 condenses all the exhaust steam into condensate, which is then sent back to the first steam generator 14 by the condensate pump 8 to complete the recovery. The water balance is controlled and ensured by the feedwater regulating valve and other devices installed on the first steam generator 14.

[0078] In this embodiment, the surplus steam can be either saturated steam or superheated steam.

[0079] Example 3

[0080] The rest of the content of this embodiment is the same as that of embodiment 1, except that:

[0081] Reference Figure 2 The surplus saturated steam recovery and utilization system in this embodiment also includes a second steam generator 15. The steam pressure generated by the second steam generator 15 is lower than the steam pressure in the low-pressure chamber. The second steam generator 15 is connected in sequence to a surface heat exchanger 16 and a condenser 7 through a pipeline.

[0082] The second steam generator 15 is connected to the condensate pump 8 via a pipeline.

[0083] In application, the surplus steam generated by the second steam generator 15 (referred to as surplus steam 2) enters the surface heat exchanger 16. The surface heat exchanger 16 uses surplus steam 2 to heat the condensate, and at the same time converts surplus steam 2 into condensate and transports it to the hot well of the condenser 7. Then, it is transported back to the second steam generator 15 through the condensate pump 8 to complete the recovery. The water balance is controlled and ensured by the feedwater regulating valve and other devices installed on the second steam generator 15.

[0084] Condenser 7 is usually under negative pressure during operation. Due to the pressure difference between surface heat exchanger 16 and condenser 7, the condensate from surface heat exchanger 16 can flow directly into the hot well of condenser 7 and be transported back to the second steam generator 15 by condensate pump 8 to complete the recovery.

[0085] In this embodiment, the surplus steam can be either saturated steam or superheated steam.

[0086] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0087] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A system for recovering and utilizing surplus saturated steam, characterized in that: It includes a boiler (1), a first dehumidifier (2), a second dehumidifier (3), a steam turbine (4), a steam-water separator reheater (5), a generator (6), and a condensate recirculation mechanism; The boiler (1) has a high-pressure chamber and a low-pressure chamber, wherein the steam pressure in the high-pressure chamber is greater than the steam pressure in the low-pressure chamber; The high-pressure chamber is connected in sequence to the first dehumidifier (2) and the steam turbine (4) via pipes; The steam turbine (4) and the steam-water separator reheater (5) are connected by a pipeline to form a dehumidification and reheating circuit; The low-pressure chamber is connected in two ways. One way is connected to the steam-water separator reheater (5) through a pipe, and the other way is connected to the second dehumidifier (3) and the steam turbine (4) in sequence through a pipe. The steam turbine (4) is connected to the generator (6); The condensate recirculation mechanism is connected to the steam turbine (4) and the boiler (1) respectively through pipelines. The condensate recirculation mechanism is used to condense the steam discharged from the steam turbine (4) and recover and transport it to the boiler (1).

2. The surplus saturated steam recovery and utilization system according to claim 1, characterized in that: The first dehumidifier (2) is connected to the steam turbine (4) via a main steam valve and a regulating valve.

3. The surplus saturated steam recovery and utilization system according to claim 1, characterized in that: In the dehumidification and reheating circuit formed by the steam turbine (4) and the steam-water separator reheater (5), a quick shut-off valve is provided on the pipeline from the steam-water separator reheater (5) to the steam turbine (4).

4. The surplus saturated steam recovery and utilization system according to claim 1, characterized in that: The second dehumidifier (3) is connected to the steam turbine (4) via a pipe equipped with a steam injection valve and a steam injection regulating valve.

5. The surplus saturated steam recovery and utilization system according to claim 1, characterized in that: A regulating valve is provided on the pipe connecting the low-pressure chamber of the boiler (1) to the steam-water separator reheater (5).

6. The surplus saturated steam recovery and utilization system according to claim 1, characterized in that: The condensate recirculation mechanism has a condenser (7), a condensate pump (8), a shaft seal heater (9), a deaerator (10), and a feedwater pump (11) connected in sequence. The steam turbine (4) is connected to the condenser (7), and the feedwater pump (11) is connected to the boiler (1); The condenser (7) is used to condense the steam discharged from the turbine (4) into condensate; the condensate pump (8) is used to transport the condensate to the deaerator (10) via the shaft seal heater (9); the shaft seal heater (9) is used to heat the condensate using the steam leaking from the turbine (4); the deaerator (10) is used to deoxygenate the condensate; and the feedwater pump (11) is used to pressurize the condensate and transport it to the boiler (1).

7. The surplus saturated steam recovery and utilization system according to claim 6, characterized in that: The deaerator (10) is connected to the steam turbine (4) via a pipeline, and the steam turbine (4) provides steam to the deaerator (10).

8. The surplus saturated steam recovery and utilization system according to claim 6, characterized in that: The steam turbine (4), the first dehumidifier (2), the second dehumidifier (3) and the steam-water separator reheater (5) are all equipped with drainage pipes; Multiple drainage pipes are provided on the pipe connecting the steam-water separator reheater (5) and the steam turbine (4); These drainage pipes are connected to the same drainage expansion container (12), which is connected to a desuperheating spray pipe (13) for spraying water into the drainage expansion container (12); the drainage expansion container (12) is connected to the hot well and throat of the condenser (7).

9. The surplus saturated steam recovery and utilization system according to claim 6, characterized in that: The surplus saturated steam recovery and utilization system also includes a first steam generator (14), the steam pressure generated by the first steam generator (14) is greater than the steam pressure of the low-pressure chamber and less than the steam pressure of the high-pressure chamber, and the first steam generator (14) is connected in sequence to a pressure reducing valve, a second dehumidifier (3) and the steam turbine (4) through a pipeline. The first steam generator (14) is connected to the condensate pump (8) via a pipeline.

10. The surplus saturated steam recovery and utilization system according to claim 6, characterized in that: The surplus saturated steam recovery and utilization system also includes a second steam generator (15), the steam pressure generated by the second steam generator (15) is lower than the steam pressure of the low-pressure chamber, and the second steam generator (15) is connected in sequence to a surface heat exchanger (16) and a condenser (7) through a pipeline. The second steam generator (15) is connected to the condensate pump (8) via a pipeline.

Images